Fix move validation in HalmaClimbers

locales/en/apgames.json

@@ -5108,6 +5108,7 @@
             "INITIAL_INSTRUCTIONS": "Select a friendly piece and use it to jump over another piece, or pass your turn.",
             "INSTRUCTIONS": "An action is either a backward movement to an adjacent empty cell or a sequence of short-jumps over pieces of either color. The sequence of jumps must start inside the player's home-base. Each player makes two actions or just passes their turn.",
             "NEXT_ACTION": "After moving the first piece, just click on the second stone to start moving or jumping.",
+            "INCOMPLETE_ACTION": "The first piece did not move; cannot start moving the second piece yet!",
             "NONEXISTENT": "Trying to interact with a friendly piece that doesn't exist at {{where}}!",
             "ILLEGAL_JUMP": "The sequence of jumps must start inside the player's home-base!",
             "TOO_MANY_ACTIONS": "This number of actions is not allowed; only one action is allowed at first, then two.",

src/games/halmaclimbers.ts

@@ -350,6 +350,13 @@ export class HalmaClimbersGame extends GameBase {
             return result;
         }
 
+        // player didn't move the first piece, and already started with the second
+        if ( actions.length === 2 && !actions[0].includes("-") ) {
+            result.valid = false;
+            result.message = i18next.t("apgames:validation.halmaclimbers.INCOMPLETE_ACTION");
+            return result;
+        }
+
         // need to move through all the moves, and check if they follow the rules
         // for that we need a copy of the board, to keep the effects of the previous actions
         const clone = new Map(this.board);