chore(release): 4.4.6 [skip ci]

## [4.4.6](https://github.com/antialias/soroban-abacus-flashcards/compare/v4.4.5...v4.4.6) (2025-10-17)

### Bug Fixes

* **complement-race:** restore smooth train movement with client-side game loop ([46a80cb](46a80cbcc8))

CHANGELOG.md

@@ -1,3 +1,24 @@
+## [4.4.6](https://github.com/antialias/soroban-abacus-flashcards/compare/v4.4.5...v4.4.6) (2025-10-17)
+
+
+### Bug Fixes
+
+* **complement-race:** restore smooth train movement with client-side game loop ([46a80cb](https://github.com/antialias/soroban-abacus-flashcards/commit/46a80cbcc8ec39224d4edaf540da25611d48fbdd))
+
+## [4.4.5](https://github.com/antialias/soroban-abacus-flashcards/compare/v4.4.4...v4.4.5) (2025-10-17)
+
+
+### Bug Fixes
+
+* **complement-race:** add missing useEffect import ([3054130](https://github.com/antialias/soroban-abacus-flashcards/commit/30541304dd0f0801860dd62967f7f7cae717bcdd))
+
+## [4.4.4](https://github.com/antialias/soroban-abacus-flashcards/compare/v4.4.3...v4.4.4) (2025-10-17)
+
+
+### Bug Fixes
+
+* **complement-race:** add pressure decay system and improve logging ([66992e8](https://github.com/antialias/soroban-abacus-flashcards/commit/66992e877065a42d00379ef8fae0a6e252b0ffcb))
+
 ## [4.4.3](https://github.com/antialias/soroban-abacus-flashcards/compare/v4.4.2...v4.4.3) (2025-10-17)
 
 

apps/web/src/arcade-games/complement-race/Provider.tsx

@@ -5,7 +5,15 @@
 
 'use client'
 
-import { createContext, useCallback, useContext, useMemo, useState, type ReactNode } from 'react'
+import {
+  createContext,
+  useCallback,
+  useContext,
+  useEffect,
+  useMemo,
+  useState,
+  type ReactNode,
+} from 'react'
 import {
   type GameMove,
   buildPlayerMetadata,
@@ -240,6 +248,14 @@ export function ComplementRaceProvider({ children }: { children: ReactNode }) {
     })
   }, [activePlayers, players])
 
+  // Debug logging ref (track last logged values)
+  const lastLogRef = useState({ key: '', count: 0 })[0]
+
+  // Client-side smooth movement state
+  const [clientPosition, setClientPosition] = useState(0)
+  const [clientPressure, setClientPressure] = useState(0)
+  const lastUpdateRef = useRef(Date.now())
+
   // Transform multiplayer state to look like single-player state
   const compatibleState = useMemo((): CompatibleGameState => {
     const localPlayer = localPlayerId ? multiplayerState.players[localPlayerId] : null
@@ -305,8 +321,8 @@ export function ComplementRaceProvider({ children }: { children: ReactNode }) {
 
       // Sprint mode specific
       momentum: localPlayer?.momentum || 0,
-      trainPosition: localPlayer?.position || 0,
-      pressure: localPlayer?.momentum ? Math.min(100, localPlayer.momentum + 10) : 0,
+      trainPosition: clientPosition, // Use client-calculated smooth position
+      pressure: clientPressure, // Use client-calculated smooth pressure
       elapsedTime: multiplayerState.gameStartTime ? Date.now() - multiplayerState.gameStartTime : 0,
       lastCorrectAnswerTime: localPlayer?.lastAnswerTime || Date.now(),
       currentRoute: multiplayerState.currentRoute,
@@ -328,11 +344,69 @@ export function ComplementRaceProvider({ children }: { children: ReactNode }) {
       adaptiveFeedback: localUIState.adaptiveFeedback,
       difficultyTracker: localUIState.difficultyTracker,
     }
-  }, [multiplayerState, localPlayerId, localUIState])
+  }, [multiplayerState, localPlayerId, localUIState, clientPosition, clientPressure])
 
-  console.log(
-    `🚂 Sprint: momentum=${compatibleState.momentum} pos=${compatibleState.trainPosition} pressure=${compatibleState.pressure}`
-  )
+  // Client-side game loop for smooth train movement
+  useEffect(() => {
+    if (compatibleState.style !== 'sprint' || !compatibleState.isGameActive) return
+
+    const UPDATE_INTERVAL = 50 // 50ms = ~20fps
+    const SPEED_MULTIPLIER = 0.15 // speed = momentum * 0.15 (% per second)
+
+    const interval = setInterval(() => {
+      const now = Date.now()
+      const deltaTime = now - lastUpdateRef.current
+      lastUpdateRef.current = now
+
+      // Get server momentum (authoritative)
+      const serverMomentum = compatibleState.momentum
+
+      // Calculate speed from momentum
+      const speed = serverMomentum * SPEED_MULTIPLIER
+
+      // Update position continuously based on momentum
+      const positionDelta = (speed * deltaTime) / 1000
+      setClientPosition((prev) => prev + positionDelta)
+
+      // Calculate pressure from momentum (0-150 PSI)
+      const pressure = Math.min(150, (serverMomentum / 100) * 150)
+      setClientPressure(pressure)
+    }, UPDATE_INTERVAL)
+
+    return () => clearInterval(interval)
+  }, [compatibleState.style, compatibleState.isGameActive, compatibleState.momentum])
+
+  // Sync client position with server position on route changes/resets
+  useEffect(() => {
+    const serverPosition = multiplayerState.players[localPlayerId || '']?.position || 0
+    // Only sync if there's a significant jump (route change)
+    if (Math.abs(serverPosition - clientPosition) > 10) {
+      setClientPosition(serverPosition)
+    }
+  }, [multiplayerState.players, localPlayerId, clientPosition])
+
+  // Debug logging: only log on answer submission or significant events
+  useEffect(() => {
+    if (compatibleState.style === 'sprint' && compatibleState.isGameActive) {
+      const key = `${compatibleState.correctAnswers}`
+
+      // Only log on new answers (not every frame)
+      if (lastLogRef.key !== key) {
+        console.log(
+          `🚂 Answer #${compatibleState.correctAnswers}: momentum=${compatibleState.momentum} pos=${Math.floor(compatibleState.trainPosition)} pressure=${compatibleState.pressure} streak=${compatibleState.streak}`
+        )
+        lastLogRef.key = key
+      }
+    }
+  }, [
+    compatibleState.correctAnswers,
+    compatibleState.momentum,
+    compatibleState.trainPosition,
+    compatibleState.pressure,
+    compatibleState.streak,
+    compatibleState.style,
+    compatibleState.isGameActive,
+  ])
 
   // Action creators
   const startGame = useCallback(() => {

apps/web/src/arcade-games/complement-race/Validator.ts

@@ -169,7 +169,7 @@ export class ComplementRaceValidator
         correctAnswers: 0,
         totalQuestions: 0,
         position: 0,
-        momentum: 50, // Start with some momentum in sprint mode
+        momentum: 50, // Start with some momentum (position/pressure calculated client-side)
         isReady: false,
         isActive: true,
         currentAnswer: null,
@@ -317,17 +317,15 @@ export class ComplementRaceValidator
         updatedPlayer.position = Math.min(100, player.position + 100 / state.config.raceGoal)
       }
     } else if (state.config.style === 'sprint') {
-      // Sprint: Update momentum AND position
+      // Sprint: Update momentum only (position calculated client-side for smooth movement)
       if (correct) {
         updatedPlayer.momentum = Math.min(100, player.momentum + 15)
       } else {
         updatedPlayer.momentum = Math.max(0, player.momentum - 10)
       }
 
-      // Move train based on momentum (momentum/20 = position change per answer)
-      // Higher momentum = faster movement
-      const moveDistance = updatedPlayer.momentum / 20
-      updatedPlayer.position = Math.min(100, player.position + moveDistance)
+      // Position is calculated client-side continuously based on momentum
+      // This allows for smooth 20fps movement instead of discrete jumps per answer
     } else if (state.config.style === 'survival') {
       // Survival: Always move forward, speed based on accuracy
       const moveDistance = correct ? 5 : 2
@@ -527,12 +525,13 @@ export class ComplementRaceValidator
       return { valid: false, error: 'Routes only available in sprint mode' }
     }
 
-    // Reset all player positions to 0
+    // Reset all player positions to 0 for new route
     const resetPlayers: Record<string, PlayerState> = {}
     for (const [playerId, player] of Object.entries(state.players)) {
       resetPlayers[playerId] = {
         ...player,
         position: 0,
+        momentum: 50, // Reset momentum to starting value
         passengers: [], // Clear any remaining passengers
       }
     }

apps/web/src/arcade-games/complement-race/types.ts

@@ -62,7 +62,7 @@ export interface PlayerState {
 
   // Position & Progress
   position: number // 0-100% for practice/sprint, lap count for survival
-  momentum: number // 0-100 (sprint mode only)
+  momentum: number // 0-100 (sprint mode only, position/pressure calculated client-side)
 
   // Current state
   isReady: boolean

package.json

@@ -1,6 +1,6 @@
 {
   "name": "soroban-monorepo",
-  "version": "4.4.3",
+  "version": "4.4.6",
   "private": true,
   "description": "Beautiful Soroban Flashcard Generator - Monorepo",
   "workspaces": [