diff --git a/zenno/src/lib/course.spec.ts b/zenno/src/lib/course.spec.ts
new file mode 100644
index 0000000..aea22e2
--- /dev/null
+++ b/zenno/src/lib/course.spec.ts
@@ -0,0 +1,195 @@
+import { expect, test } from "vitest";
+import * as course from './course';
+import { Phase } from "./race";
+
+test.for<{raceLen: number, slopes: course.Slope[], want: course.SectionSlopeSegment[]}>([
+    {
+        raceLen: 1200,
+        slopes: [],
+        want: [
+            {section: 1, phase: Phase.EarlyRace, endRate: 1/24, posKeep: true, rush: false, spotStruggleEnter: false, startDist: 0, endDist: 50, slope: 0},
+            {section: 2, phase: Phase.EarlyRace, endRate: 2/24, posKeep: true, rush: true, spotStruggleEnter: true, startDist: 50, endDist: 100, slope: 0},
+            {section: 3, phase: Phase.EarlyRace, endRate: 3/24, posKeep: true, rush: true, spotStruggleEnter: true, startDist: 100, endDist: 150, slope: 0},
+            {section: 4, phase: Phase.EarlyRace, endRate: 4/24, posKeep: true, rush: true, spotStruggleEnter: true, startDist: 150, endDist: 200, slope: 0},
+            {section: 5, phase: Phase.MidRace, endRate: 5/24, posKeep: true, rush: true, spotStruggleEnter: true, startDist: 200, endDist: 250, slope: 0},
+            {section: 6, phase: Phase.MidRace, endRate: 6/24, posKeep: true, rush: true, spotStruggleEnter: false, startDist: 250, endDist: 300, slope: 0},
+            {section: 7, phase: Phase.MidRace, endRate: 7/24, posKeep: true, rush: true, spotStruggleEnter: false, startDist: 300, endDist: 350, slope: 0},
+            {section: 8, phase: Phase.MidRace, endRate: 8/24, posKeep: true, rush: true, spotStruggleEnter: false, startDist: 350, endDist: 400, slope: 0},
+            {section: 9, phase: Phase.MidRace, endRate: 9/24, posKeep: true, rush: true, spotStruggleEnter: false, startDist: 400, endDist: 450, slope: 0},
+            {section: 10, phase: Phase.MidRace, endRate: 10/24, posKeep: true, rush: false, spotStruggleEnter: false, startDist: 450, endDist: 500, slope: 0},
+            {section: 11, phase: Phase.MidRace, endRate: 11/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 500, endDist: 550, slope: 0},
+            {section: 12, phase: Phase.MidRace, endRate: 12/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 550, endDist: 600, slope: 0},
+            {section: 13, phase: Phase.MidRace, endRate: 13/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 600, endDist: 650, slope: 0},
+            {section: 14, phase: Phase.MidRace, endRate: 14/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 650, endDist: 700, slope: 0},
+            {section: 15, phase: Phase.MidRace, endRate: 15/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 700, endDist: 750, slope: 0},
+            {section: 16, phase: Phase.MidRace, endRate: 16/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 750, endDist: 800, slope: 0},
+            {section: 17, phase: Phase.LateRace, endRate: 17/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 800, endDist: 850, slope: 0},
+            {section: 18, phase: Phase.LateRace, endRate: 18/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 850, endDist: 900, slope: 0},
+            {section: 19, phase: Phase.LateRace, endRate: 19/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 900, endDist: 950, slope: 0},
+            {section: 20, phase: Phase.LateRace, endRate: 20/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 950, endDist: 1000, slope: 0},
+            {section: 21, phase: Phase.LateRace, endRate: 21/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 1000, endDist: 1050, slope: 0},
+            {section: 22, phase: Phase.LateRace, endRate: 22/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 1050, endDist: 1100, slope: 0},
+            {section: 23, phase: Phase.LateRace, endRate: 23/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 1100, endDist: 1150, slope: 0},
+            {section: 24, phase: Phase.LateRace, endRate: 24/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 1150, endDist: 1200, slope: 0},
+        ],
+    },
+    {
+        raceLen: 1200,
+        slopes: [{per: 1, span: [0, 25]}],
+        want: [
+            {section: 1, phase: Phase.EarlyRace, endRate: 1/24, posKeep: true, rush: false, spotStruggleEnter: false, startDist: 0, endDist: 25, slope: 1},
+            {section: 1, phase: Phase.EarlyRace, endRate: 1/24, posKeep: true, rush: false, spotStruggleEnter: false, startDist: 25, endDist: 50, slope: 0},
+            {section: 2, phase: Phase.EarlyRace, endRate: 2/24, posKeep: true, rush: true, spotStruggleEnter: true, startDist: 50, endDist: 100, slope: 0},
+            {section: 3, phase: Phase.EarlyRace, endRate: 3/24, posKeep: true, rush: true, spotStruggleEnter: true, startDist: 100, endDist: 150, slope: 0},
+            {section: 4, phase: Phase.EarlyRace, endRate: 4/24, posKeep: true, rush: true, spotStruggleEnter: true, startDist: 150, endDist: 200, slope: 0},
+            {section: 5, phase: Phase.MidRace, endRate: 5/24, posKeep: true, rush: true, spotStruggleEnter: true, startDist: 200, endDist: 250, slope: 0},
+            {section: 6, phase: Phase.MidRace, endRate: 6/24, posKeep: true, rush: true, spotStruggleEnter: false, startDist: 250, endDist: 300, slope: 0},
+            {section: 7, phase: Phase.MidRace, endRate: 7/24, posKeep: true, rush: true, spotStruggleEnter: false, startDist: 300, endDist: 350, slope: 0},
+            {section: 8, phase: Phase.MidRace, endRate: 8/24, posKeep: true, rush: true, spotStruggleEnter: false, startDist: 350, endDist: 400, slope: 0},
+            {section: 9, phase: Phase.MidRace, endRate: 9/24, posKeep: true, rush: true, spotStruggleEnter: false, startDist: 400, endDist: 450, slope: 0},
+            {section: 10, phase: Phase.MidRace, endRate: 10/24, posKeep: true, rush: false, spotStruggleEnter: false, startDist: 450, endDist: 500, slope: 0},
+            {section: 11, phase: Phase.MidRace, endRate: 11/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 500, endDist: 550, slope: 0},
+            {section: 12, phase: Phase.MidRace, endRate: 12/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 550, endDist: 600, slope: 0},
+            {section: 13, phase: Phase.MidRace, endRate: 13/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 600, endDist: 650, slope: 0},
+            {section: 14, phase: Phase.MidRace, endRate: 14/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 650, endDist: 700, slope: 0},
+            {section: 15, phase: Phase.MidRace, endRate: 15/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 700, endDist: 750, slope: 0},
+            {section: 16, phase: Phase.MidRace, endRate: 16/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 750, endDist: 800, slope: 0},
+            {section: 17, phase: Phase.LateRace, endRate: 17/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 800, endDist: 850, slope: 0},
+            {section: 18, phase: Phase.LateRace, endRate: 18/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 850, endDist: 900, slope: 0},
+            {section: 19, phase: Phase.LateRace, endRate: 19/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 900, endDist: 950, slope: 0},
+            {section: 20, phase: Phase.LateRace, endRate: 20/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 950, endDist: 1000, slope: 0},
+            {section: 21, phase: Phase.LateRace, endRate: 21/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 1000, endDist: 1050, slope: 0},
+            {section: 22, phase: Phase.LateRace, endRate: 22/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 1050, endDist: 1100, slope: 0},
+            {section: 23, phase: Phase.LateRace, endRate: 23/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 1100, endDist: 1150, slope: 0},
+            {section: 24, phase: Phase.LateRace, endRate: 24/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 1150, endDist: 1200, slope: 0},
+        ],
+    },
+    {
+        raceLen: 1200,
+        slopes: [{per: 1, span: [0, 50]}],
+        want: [
+            {section: 1, phase: Phase.EarlyRace, endRate: 1/24, posKeep: true, rush: false, spotStruggleEnter: false, startDist: 0, endDist: 50, slope: 1},
+            {section: 2, phase: Phase.EarlyRace, endRate: 2/24, posKeep: true, rush: true, spotStruggleEnter: true, startDist: 50, endDist: 100, slope: 0},
+            {section: 3, phase: Phase.EarlyRace, endRate: 3/24, posKeep: true, rush: true, spotStruggleEnter: true, startDist: 100, endDist: 150, slope: 0},
+            {section: 4, phase: Phase.EarlyRace, endRate: 4/24, posKeep: true, rush: true, spotStruggleEnter: true, startDist: 150, endDist: 200, slope: 0},
+            {section: 5, phase: Phase.MidRace, endRate: 5/24, posKeep: true, rush: true, spotStruggleEnter: true, startDist: 200, endDist: 250, slope: 0},
+            {section: 6, phase: Phase.MidRace, endRate: 6/24, posKeep: true, rush: true, spotStruggleEnter: false, startDist: 250, endDist: 300, slope: 0},
+            {section: 7, phase: Phase.MidRace, endRate: 7/24, posKeep: true, rush: true, spotStruggleEnter: false, startDist: 300, endDist: 350, slope: 0},
+            {section: 8, phase: Phase.MidRace, endRate: 8/24, posKeep: true, rush: true, spotStruggleEnter: false, startDist: 350, endDist: 400, slope: 0},
+            {section: 9, phase: Phase.MidRace, endRate: 9/24, posKeep: true, rush: true, spotStruggleEnter: false, startDist: 400, endDist: 450, slope: 0},
+            {section: 10, phase: Phase.MidRace, endRate: 10/24, posKeep: true, rush: false, spotStruggleEnter: false, startDist: 450, endDist: 500, slope: 0},
+            {section: 11, phase: Phase.MidRace, endRate: 11/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 500, endDist: 550, slope: 0},
+            {section: 12, phase: Phase.MidRace, endRate: 12/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 550, endDist: 600, slope: 0},
+            {section: 13, phase: Phase.MidRace, endRate: 13/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 600, endDist: 650, slope: 0},
+            {section: 14, phase: Phase.MidRace, endRate: 14/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 650, endDist: 700, slope: 0},
+            {section: 15, phase: Phase.MidRace, endRate: 15/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 700, endDist: 750, slope: 0},
+            {section: 16, phase: Phase.MidRace, endRate: 16/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 750, endDist: 800, slope: 0},
+            {section: 17, phase: Phase.LateRace, endRate: 17/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 800, endDist: 850, slope: 0},
+            {section: 18, phase: Phase.LateRace, endRate: 18/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 850, endDist: 900, slope: 0},
+            {section: 19, phase: Phase.LateRace, endRate: 19/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 900, endDist: 950, slope: 0},
+            {section: 20, phase: Phase.LateRace, endRate: 20/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 950, endDist: 1000, slope: 0},
+            {section: 21, phase: Phase.LateRace, endRate: 21/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 1000, endDist: 1050, slope: 0},
+            {section: 22, phase: Phase.LateRace, endRate: 22/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 1050, endDist: 1100, slope: 0},
+            {section: 23, phase: Phase.LateRace, endRate: 23/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 1100, endDist: 1150, slope: 0},
+            {section: 24, phase: Phase.LateRace, endRate: 24/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 1150, endDist: 1200, slope: 0},
+        ],
+    },
+    {
+        raceLen: 1200,
+        slopes: [{per: 1, span: [0, 225]}],
+        want: [
+            {section: 1, phase: Phase.EarlyRace, endRate: 1/24, posKeep: true, rush: false, spotStruggleEnter: false, startDist: 0, endDist: 50, slope: 1},
+            {section: 2, phase: Phase.EarlyRace, endRate: 2/24, posKeep: true, rush: true, spotStruggleEnter: true, startDist: 50, endDist: 100, slope: 1},
+            {section: 3, phase: Phase.EarlyRace, endRate: 3/24, posKeep: true, rush: true, spotStruggleEnter: true, startDist: 100, endDist: 150, slope: 1},
+            {section: 4, phase: Phase.EarlyRace, endRate: 4/24, posKeep: true, rush: true, spotStruggleEnter: true, startDist: 150, endDist: 200, slope: 1},
+            {section: 5, phase: Phase.MidRace, endRate: 5/24, posKeep: true, rush: true, spotStruggleEnter: true, startDist: 200, endDist: 225, slope: 1},
+            {section: 5, phase: Phase.MidRace, endRate: 5/24, posKeep: true, rush: true, spotStruggleEnter: true, startDist: 225, endDist: 250, slope: 0},
+            {section: 6, phase: Phase.MidRace, endRate: 6/24, posKeep: true, rush: true, spotStruggleEnter: false, startDist: 250, endDist: 300, slope: 0},
+            {section: 7, phase: Phase.MidRace, endRate: 7/24, posKeep: true, rush: true, spotStruggleEnter: false, startDist: 300, endDist: 350, slope: 0},
+            {section: 8, phase: Phase.MidRace, endRate: 8/24, posKeep: true, rush: true, spotStruggleEnter: false, startDist: 350, endDist: 400, slope: 0},
+            {section: 9, phase: Phase.MidRace, endRate: 9/24, posKeep: true, rush: true, spotStruggleEnter: false, startDist: 400, endDist: 450, slope: 0},
+            {section: 10, phase: Phase.MidRace, endRate: 10/24, posKeep: true, rush: false, spotStruggleEnter: false, startDist: 450, endDist: 500, slope: 0},
+            {section: 11, phase: Phase.MidRace, endRate: 11/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 500, endDist: 550, slope: 0},
+            {section: 12, phase: Phase.MidRace, endRate: 12/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 550, endDist: 600, slope: 0},
+            {section: 13, phase: Phase.MidRace, endRate: 13/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 600, endDist: 650, slope: 0},
+            {section: 14, phase: Phase.MidRace, endRate: 14/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 650, endDist: 700, slope: 0},
+            {section: 15, phase: Phase.MidRace, endRate: 15/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 700, endDist: 750, slope: 0},
+            {section: 16, phase: Phase.MidRace, endRate: 16/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 750, endDist: 800, slope: 0},
+            {section: 17, phase: Phase.LateRace, endRate: 17/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 800, endDist: 850, slope: 0},
+            {section: 18, phase: Phase.LateRace, endRate: 18/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 850, endDist: 900, slope: 0},
+            {section: 19, phase: Phase.LateRace, endRate: 19/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 900, endDist: 950, slope: 0},
+            {section: 20, phase: Phase.LateRace, endRate: 20/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 950, endDist: 1000, slope: 0},
+            {section: 21, phase: Phase.LateRace, endRate: 21/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 1000, endDist: 1050, slope: 0},
+            {section: 22, phase: Phase.LateRace, endRate: 22/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 1050, endDist: 1100, slope: 0},
+            {section: 23, phase: Phase.LateRace, endRate: 23/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 1100, endDist: 1150, slope: 0},
+            {section: 24, phase: Phase.LateRace, endRate: 24/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 1150, endDist: 1200, slope: 0},
+        ],
+    },
+    {
+        raceLen: 1200,
+        slopes: [{per: 1, span: [25, 50]}],
+        want: [
+            {section: 1, phase: Phase.EarlyRace, endRate: 1/24, posKeep: true, rush: false, spotStruggleEnter: false, startDist: 0, endDist: 25, slope: 0},
+            {section: 1, phase: Phase.EarlyRace, endRate: 1/24, posKeep: true, rush: false, spotStruggleEnter: false, startDist: 25, endDist: 50, slope: 1},
+            {section: 2, phase: Phase.EarlyRace, endRate: 2/24, posKeep: true, rush: true, spotStruggleEnter: true, startDist: 50, endDist: 100, slope: 0},
+            {section: 3, phase: Phase.EarlyRace, endRate: 3/24, posKeep: true, rush: true, spotStruggleEnter: true, startDist: 100, endDist: 150, slope: 0},
+            {section: 4, phase: Phase.EarlyRace, endRate: 4/24, posKeep: true, rush: true, spotStruggleEnter: true, startDist: 150, endDist: 200, slope: 0},
+            {section: 5, phase: Phase.MidRace, endRate: 5/24, posKeep: true, rush: true, spotStruggleEnter: true, startDist: 200, endDist: 250, slope: 0},
+            {section: 6, phase: Phase.MidRace, endRate: 6/24, posKeep: true, rush: true, spotStruggleEnter: false, startDist: 250, endDist: 300, slope: 0},
+            {section: 7, phase: Phase.MidRace, endRate: 7/24, posKeep: true, rush: true, spotStruggleEnter: false, startDist: 300, endDist: 350, slope: 0},
+            {section: 8, phase: Phase.MidRace, endRate: 8/24, posKeep: true, rush: true, spotStruggleEnter: false, startDist: 350, endDist: 400, slope: 0},
+            {section: 9, phase: Phase.MidRace, endRate: 9/24, posKeep: true, rush: true, spotStruggleEnter: false, startDist: 400, endDist: 450, slope: 0},
+            {section: 10, phase: Phase.MidRace, endRate: 10/24, posKeep: true, rush: false, spotStruggleEnter: false, startDist: 450, endDist: 500, slope: 0},
+            {section: 11, phase: Phase.MidRace, endRate: 11/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 500, endDist: 550, slope: 0},
+            {section: 12, phase: Phase.MidRace, endRate: 12/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 550, endDist: 600, slope: 0},
+            {section: 13, phase: Phase.MidRace, endRate: 13/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 600, endDist: 650, slope: 0},
+            {section: 14, phase: Phase.MidRace, endRate: 14/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 650, endDist: 700, slope: 0},
+            {section: 15, phase: Phase.MidRace, endRate: 15/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 700, endDist: 750, slope: 0},
+            {section: 16, phase: Phase.MidRace, endRate: 16/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 750, endDist: 800, slope: 0},
+            {section: 17, phase: Phase.LateRace, endRate: 17/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 800, endDist: 850, slope: 0},
+            {section: 18, phase: Phase.LateRace, endRate: 18/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 850, endDist: 900, slope: 0},
+            {section: 19, phase: Phase.LateRace, endRate: 19/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 900, endDist: 950, slope: 0},
+            {section: 20, phase: Phase.LateRace, endRate: 20/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 950, endDist: 1000, slope: 0},
+            {section: 21, phase: Phase.LateRace, endRate: 21/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 1000, endDist: 1050, slope: 0},
+            {section: 22, phase: Phase.LateRace, endRate: 22/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 1050, endDist: 1100, slope: 0},
+            {section: 23, phase: Phase.LateRace, endRate: 23/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 1100, endDist: 1150, slope: 0},
+            {section: 24, phase: Phase.LateRace, endRate: 24/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 1150, endDist: 1200, slope: 0},
+        ],
+    },
+    {
+        raceLen: 1200,
+        slopes: [{per: 1, span: [10, 20]}, {per: -1, span: [30, 40]}],
+        want: [
+            {section: 1, phase: Phase.EarlyRace, endRate: 1/24, posKeep: true, rush: false, spotStruggleEnter: false, startDist: 0, endDist: 10, slope: 0},
+            {section: 1, phase: Phase.EarlyRace, endRate: 1/24, posKeep: true, rush: false, spotStruggleEnter: false, startDist: 10, endDist: 20, slope: 1},
+            {section: 1, phase: Phase.EarlyRace, endRate: 1/24, posKeep: true, rush: false, spotStruggleEnter: false, startDist: 20, endDist: 30, slope: 0},
+            {section: 1, phase: Phase.EarlyRace, endRate: 1/24, posKeep: true, rush: false, spotStruggleEnter: false, startDist: 30, endDist: 40, slope: -1},
+            {section: 1, phase: Phase.EarlyRace, endRate: 1/24, posKeep: true, rush: false, spotStruggleEnter: false, startDist: 40, endDist: 50, slope: 0},
+            {section: 2, phase: Phase.EarlyRace, endRate: 2/24, posKeep: true, rush: true, spotStruggleEnter: true, startDist: 50, endDist: 100, slope: 0},
+            {section: 3, phase: Phase.EarlyRace, endRate: 3/24, posKeep: true, rush: true, spotStruggleEnter: true, startDist: 100, endDist: 150, slope: 0},
+            {section: 4, phase: Phase.EarlyRace, endRate: 4/24, posKeep: true, rush: true, spotStruggleEnter: true, startDist: 150, endDist: 200, slope: 0},
+            {section: 5, phase: Phase.MidRace, endRate: 5/24, posKeep: true, rush: true, spotStruggleEnter: true, startDist: 200, endDist: 250, slope: 0},
+            {section: 6, phase: Phase.MidRace, endRate: 6/24, posKeep: true, rush: true, spotStruggleEnter: false, startDist: 250, endDist: 300, slope: 0},
+            {section: 7, phase: Phase.MidRace, endRate: 7/24, posKeep: true, rush: true, spotStruggleEnter: false, startDist: 300, endDist: 350, slope: 0},
+            {section: 8, phase: Phase.MidRace, endRate: 8/24, posKeep: true, rush: true, spotStruggleEnter: false, startDist: 350, endDist: 400, slope: 0},
+            {section: 9, phase: Phase.MidRace, endRate: 9/24, posKeep: true, rush: true, spotStruggleEnter: false, startDist: 400, endDist: 450, slope: 0},
+            {section: 10, phase: Phase.MidRace, endRate: 10/24, posKeep: true, rush: false, spotStruggleEnter: false, startDist: 450, endDist: 500, slope: 0},
+            {section: 11, phase: Phase.MidRace, endRate: 11/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 500, endDist: 550, slope: 0},
+            {section: 12, phase: Phase.MidRace, endRate: 12/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 550, endDist: 600, slope: 0},
+            {section: 13, phase: Phase.MidRace, endRate: 13/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 600, endDist: 650, slope: 0},
+            {section: 14, phase: Phase.MidRace, endRate: 14/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 650, endDist: 700, slope: 0},
+            {section: 15, phase: Phase.MidRace, endRate: 15/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 700, endDist: 750, slope: 0},
+            {section: 16, phase: Phase.MidRace, endRate: 16/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 750, endDist: 800, slope: 0},
+            {section: 17, phase: Phase.LateRace, endRate: 17/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 800, endDist: 850, slope: 0},
+            {section: 18, phase: Phase.LateRace, endRate: 18/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 850, endDist: 900, slope: 0},
+            {section: 19, phase: Phase.LateRace, endRate: 19/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 900, endDist: 950, slope: 0},
+            {section: 20, phase: Phase.LateRace, endRate: 20/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 950, endDist: 1000, slope: 0},
+            {section: 21, phase: Phase.LateRace, endRate: 21/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 1000, endDist: 1050, slope: 0},
+            {section: 22, phase: Phase.LateRace, endRate: 22/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 1050, endDist: 1100, slope: 0},
+            {section: 23, phase: Phase.LateRace, endRate: 23/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 1100, endDist: 1150, slope: 0},
+            {section: 24, phase: Phase.LateRace, endRate: 24/24, posKeep: false, rush: false, spotStruggleEnter: false, startDist: 1150, endDist: 1200, slope: 0},
+        ],
+    },
+])('splitSectionSlopes($raceLen, $slopes)', ({raceLen, slopes, want}) => {
+    expect(course.splitSectionSlopes(raceLen, slopes)).toEqual(want);
+})
\ No newline at end of file
diff --git a/zenno/src/lib/course.ts b/zenno/src/lib/course.ts
new file mode 100644
index 0000000..6aa87a1
--- /dev/null
+++ b/zenno/src/lib/course.ts
@@ -0,0 +1,136 @@
+import * as math from 'mathjs';
+import { Phase, type Stat, type Surface } from "./race";
+
+export interface Race {
+    location: RaceLocation;
+    length: number;
+    surface: Surface;
+    direction: Direction;
+    spans: Span[];
+    slopes: Slope[];
+    thresholds: [] | [Stat] | [Stat, Stat];
+}
+
+export enum RaceLocation {
+    Sapporo = 'Sapporo',
+    Hakodate = 'Hakodate',
+    Niigata = 'Niigata',
+    Fukushima = 'Fukushima',
+    Nakayama = 'Nakayama',
+    Tokyo = 'Tokyo',
+    Chukyo = 'Chukyo',
+    Kyoto = 'Kyoto',
+    Hanshin = 'Hanshin',
+    Kokura = 'Kokura',
+    Ooi = 'Ooi',
+    Kawasaki = 'Kawasaki',
+    Funabashi = 'Funabashi',
+    Morioka = 'Morioka',
+    Longchamp = 'Longchamp',
+    SantaAnitaPark = 'Santa Anita Park',
+    DelMar = 'Del Mar',
+}
+
+export enum Direction {
+    Right,
+    Left,
+    Stretch,
+}
+
+export enum SpanType {
+    FrontStraight,
+    AcrossStraight,
+    FalseStraight,
+    Corner1,
+    Corner2,
+    Corner3,
+    Corner4,
+}
+
+export interface Span {
+    type: SpanType;
+    span: [number, number];
+}
+
+export interface Slope {
+    per: -2 | -1.5 | -1 | 1 | 1.5 | 2;
+    span: [number, number];
+}
+
+function sortSlopes(slopes: Slope[]): Slope[] {
+    return slopes.toSorted((a, b) => a.span[0] - b.span[0]);
+}
+
+/**
+ * Get the distances into a race where each phase ends.
+ * @param raceLen Length of the race in meters
+ * @returns Quadruple of phase end points, including separate late and last spurt phases
+ */
+export function phases(raceLen: number): [number, number, number, number] {
+    const sixth = raceLen / 6;
+    const half = raceLen / 2;
+    return [sixth, sixth + half, 2*sixth + half, raceLen];
+}
+
+export interface SectionInfo {
+    section: number;
+    phase: Phase;
+    endRate: number;
+    posKeep: boolean;
+    rush: boolean;
+    spotStruggleEnter: boolean;
+}
+
+export const SECTIONS: ReadonlyArray<SectionInfo> = [
+    {section: 1, phase: Phase.EarlyRace, endRate: 1/24, posKeep: true, rush: false, spotStruggleEnter: false},
+    {section: 2, phase: Phase.EarlyRace, endRate: 2/24, posKeep: true, rush: true, spotStruggleEnter: true},
+    {section: 3, phase: Phase.EarlyRace, endRate: 3/24, posKeep: true, rush: true, spotStruggleEnter: true},
+    {section: 4, phase: Phase.EarlyRace, endRate: 4/24, posKeep: true, rush: true, spotStruggleEnter: true},
+    {section: 5, phase: Phase.MidRace, endRate: 5/24, posKeep: true, rush: true, spotStruggleEnter: true},
+    {section: 6, phase: Phase.MidRace, endRate: 6/24, posKeep: true, rush: true, spotStruggleEnter: false},
+    {section: 7, phase: Phase.MidRace, endRate: 7/24, posKeep: true, rush: true, spotStruggleEnter: false},
+    {section: 8, phase: Phase.MidRace, endRate: 8/24, posKeep: true, rush: true, spotStruggleEnter: false},
+    {section: 9, phase: Phase.MidRace, endRate: 9/24, posKeep: true, rush: true, spotStruggleEnter: false},
+    {section: 10, phase: Phase.MidRace, endRate: 10/24, posKeep: true, rush: false, spotStruggleEnter: false},
+    {section: 11, phase: Phase.MidRace, endRate: 11/24, posKeep: false, rush: false, spotStruggleEnter: false},
+    {section: 12, phase: Phase.MidRace, endRate: 12/24, posKeep: false, rush: false, spotStruggleEnter: false},
+    {section: 13, phase: Phase.MidRace, endRate: 13/24, posKeep: false, rush: false, spotStruggleEnter: false},
+    {section: 14, phase: Phase.MidRace, endRate: 14/24, posKeep: false, rush: false, spotStruggleEnter: false},
+    {section: 15, phase: Phase.MidRace, endRate: 15/24, posKeep: false, rush: false, spotStruggleEnter: false},
+    {section: 16, phase: Phase.MidRace, endRate: 16/24, posKeep: false, rush: false, spotStruggleEnter: false},
+    {section: 17, phase: Phase.LateRace, endRate: 17/24, posKeep: false, rush: false, spotStruggleEnter: false},
+    {section: 18, phase: Phase.LateRace, endRate: 18/24, posKeep: false, rush: false, spotStruggleEnter: false},
+    {section: 19, phase: Phase.LateRace, endRate: 19/24, posKeep: false, rush: false, spotStruggleEnter: false},
+    {section: 20, phase: Phase.LateRace, endRate: 20/24, posKeep: false, rush: false, spotStruggleEnter: false},
+    {section: 21, phase: Phase.LateRace, endRate: 21/24, posKeep: false, rush: false, spotStruggleEnter: false},
+    {section: 22, phase: Phase.LateRace, endRate: 22/24, posKeep: false, rush: false, spotStruggleEnter: false},
+    {section: 23, phase: Phase.LateRace, endRate: 23/24, posKeep: false, rush: false, spotStruggleEnter: false},
+    {section: 24, phase: Phase.LateRace, endRate: 24/24, posKeep: false, rush: false, spotStruggleEnter: false},
+];
+
+export interface SectionSlopeSegment extends SectionInfo {
+    startDist: number;
+    endDist: number;
+    slope: -2 | -1.5 | -1 | 0 | 1 | 1.5 | 2;
+}
+
+export function splitSectionSlopes(raceLen: number, slopes: Slope[]): SectionSlopeSegment[] {
+    const ss = sortSlopes(slopes);
+    return SECTIONS.flatMap<SectionSlopeSegment>((sec) => {
+        const startDist = (sec.section - 1) * raceLen / 24;
+        const endDist = sec.section * raceLen / 24;
+        const s = ss.filter((sl) => sl.span[0] < endDist && sl.span[1] > startDist);
+        if (s.length === 0) {
+            return [{...sec, startDist, endDist, slope: 0}];
+        }
+        const r: Array<SectionSlopeSegment> = [{...sec, startDist, endDist: math.min(s[0].span[0], endDist), slope: 0}];
+        for (const [i, sl] of s.entries()) {
+            const slopeEnd = math.min(endDist, sl.span[1]);
+            r.push(
+                {...sec, startDist: math.max(startDist, sl.span[0]), endDist: slopeEnd, slope: sl.per},
+                {...sec, startDist: slopeEnd, endDist: math.min(s[i+1]?.span[0] ?? endDist, endDist), slope: 0},
+            );
+        }
+        return r.filter((sl) => sl.startDist < sl.endDist);
+    })
+}
diff --git a/zenno/src/routes/race/stam/+page.svelte b/zenno/src/routes/race/stam/+page.svelte
new file mode 100644
index 0000000..80f6f56
--- /dev/null
+++ b/zenno/src/routes/race/stam/+page.svelte
@@ -0,0 +1,86 @@
+<script lang="ts">
+    import * as course from '$lib/course';
+    import * as race from '$lib/race';
+
+    let rawStats = $state({
+        [race.Stat.Speed]: 1200,
+        [race.Stat.Stamina]: 1200,
+        [race.Stat.Power]: 1200,
+        [race.Stat.Guts]: 1200,
+        [race.Stat.Wit]: 1200,
+    });
+    let style = $state(race.RunningStyle.FrontRunner);
+    let surfaceApt = $state(race.AptitudeLevel.A);
+    let distanceApt = $state(race.AptitudeLevel.S);
+    let styleApt = $state(race.AptitudeLevel.A);
+    let mood = $state(race.Mood.Normal);
+    let isCareer = $state(false);
+    let skillStatBonus = $state({
+        [race.Stat.Speed]: 0,
+        [race.Stat.Stamina]: 0,
+        [race.Stat.Power]: 0,
+        [race.Stat.Guts]: 0,
+        [race.Stat.Wit]: 0,
+    });
+    
+    let raceLen = $state(2000);
+    let slopesRaw: course.Slope[] = $state([]);
+    let surface = $state(race.Surface.Turf);
+    let conditions = $state(race.GroundConditions.Firm);
+    let thresh1: race.Stat | undefined = $state();
+    let thresh2: race.Stat | undefined = $state();
+
+    const baseStats = $derived({
+        [race.Stat.Speed]: race.baseStat(mood, rawStats[race.Stat.Speed]),
+        [race.Stat.Stamina]: race.baseStat(mood, rawStats[race.Stat.Stamina]),
+        [race.Stat.Power]: race.baseStat(mood, rawStats[race.Stat.Power]),
+        [race.Stat.Guts]: race.baseStat(mood, rawStats[race.Stat.Guts]),
+        [race.Stat.Wit]: race.baseStat(mood, rawStats[race.Stat.Wit]),
+    });
+
+    const thresholdMod = $derived.by(() => {
+        if (thresh1 == null) {
+            if (thresh2 == null) {
+                return 1;
+            }
+            return race.thresholdMod(baseStats[thresh2]);
+        }
+        if (thresh2 == null) {
+            return race.thresholdMod(baseStats[thresh1]);
+        }
+        return race.thresholdMod(baseStats[thresh1], baseStats[thresh2]);
+    });
+
+    const adjStats = $derived({
+        [race.Stat.Speed]: race.adjustedStat(race.Stat.Speed, baseStats[race.Stat.Speed], isCareer, surface, conditions, thresholdMod),
+        [race.Stat.Stamina]: race.adjustedStat(race.Stat.Stamina, baseStats[race.Stat.Stamina], isCareer),
+        [race.Stat.Power]: race.adjustedStat(race.Stat.Power, baseStats[race.Stat.Power], isCareer, surface, conditions),
+        [race.Stat.Guts]: race.adjustedStat(race.Stat.Guts, baseStats[race.Stat.Guts], isCareer),
+        [race.Stat.Wit]: race.adjustedStat(race.Stat.Wit, baseStats[race.Stat.Wit], isCareer, styleApt),
+    });
+
+    const stats = $derived({
+        [race.Stat.Speed]: race.finalStat(adjStats[race.Stat.Speed], skillStatBonus[race.Stat.Speed]),
+        [race.Stat.Stamina]: race.finalStat(adjStats[race.Stat.Stamina], skillStatBonus[race.Stat.Stamina]),
+        [race.Stat.Power]: race.finalStat(adjStats[race.Stat.Power], skillStatBonus[race.Stat.Power]),
+        [race.Stat.Guts]: race.finalStat(adjStats[race.Stat.Guts], skillStatBonus[race.Stat.Guts]),
+        [race.Stat.Wit]: race.finalStat(adjStats[race.Stat.Wit], skillStatBonus[race.Stat.Wit]),
+    });
+
+    let pdmTime = $state(0);
+    let rushedEnabled = $state(true);
+    let spotStruggleEnabled = $state(true);
+
+    const phases = $derived(course.phases(raceLen));
+    const sectionSlopes = $derived(course.splitSectionSlopes(raceLen, slopesRaw));
+    
+    const sectionLen = $derived(raceLen / course.SECTIONS.length);
+    const phaseSpeed = $derived({
+        [race.Phase.EarlyRace]: race.sectionSpeed(raceLen, baseStats[race.Stat.Wit], stats[race.Stat.Wit], style, race.Phase.EarlyRace),
+        [race.Phase.MidRace]: race.sectionSpeed(raceLen, baseStats[race.Stat.Wit], stats[race.Stat.Wit], style, race.Phase.MidRace),
+    });
+
+    const spurtSpeed = $derived(race.spurtSpeed(stats[race.Stat.Speed], stats[race.Stat.Guts], style, distanceApt, raceLen));
+    const spurtHPRate = $derived(race.hpPerSecond(raceLen, surface, conditions, stats[race.Stat.Guts], race.Phase.LateRace, spurtSpeed));
+    const needHP = $derived(race.fullSpurtHP(raceLen, spurtSpeed, spurtHPRate));
+</script>
\ No newline at end of file