The chase rule: AB-JChess vs jqe

AB-JChess vs jqe: 5 games read by both engines

109 moves

The chase rule: one of 600 games between AB-JChess-20261031 and jqe on 2026-10-31, 4 seconds a move on 4 threads. AB-JChess has Red. The game is drawn; the board faces Black, whose chances jqe read first at the marked move. The graph is both engines' chance for Black, AB-JChess t…

AB-JChess, with Red, moves the chariot from c9 to c3 here, attacking Black’s horse on a3. jqe would move it to f9 and take the advisor on f7 next, while Black’s chariot runs down to d1.

From here Red’s chariot attacks the horse after every move it makes. jqe’s rule calls a side that chases on every move lost, so it scores Black far ahead; AB-JChess’s rule sees the horse chasing back and scores a draw.

Searched on its own with each chase rule on and off, jqe gives Red -2.9 with its rule and 0 without; AB-JChess gives 0 either way.

Drawn: the same position came up a third time. Mistboard draws it too: a side loses a repetition only if it gave check on every move of it.