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

5 games from the 600-game match between AB-JChess-20261031 and jqe on 2026-10-31, and one drawn game where their chase rules disagree. The graph under each game is both engines' chance at the match's 4 seconds a move, the comments mark where the game turned, and wherever the two engines would play different moves, both are drawn as arrows. From the post at mistboard.com/blog/ab-jchess-vs-jqe.

6 chapters

1. Game 1: jqe vs AB-JChess206 moves

   Game 1 of the post: one of 600 games between AB-JChess-20261031 and jqe on 2026-10-31, 4 seconds a move on 4 threads. jqe has Red. The board faces the winner, AB-JChess (Black). The graph is both engines' chance for Black, AB-JChess teal and jqe orange. Wherever the two engines w…

   Every piece is face up. jqe, with Red, pushes the soldier from d5 to d6 here; AB-JChess would bring the horse from e6 to c5 to take Black’s advisor on d3, giving the horse back for it.

2. Game 2: AB-JChess vs jqe131 moves

   Game 2 of the post: 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 board faces the winner, AB-JChess (Red). The graph is both engines' chance for Red, AB-JChess teal and jqe orange. Wherever the two engines…

   Black’s chariot takes a face-down piece on g1, on Red’s back rank.

3. Game 3: AB-JChess vs jqe143 moves

   Game 3 of the post: 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 board faces the winner, AB-JChess (Red). The graph is both engines' chance for Red, AB-JChess teal and jqe orange. Wherever the two engines…

   Black’s soldier takes a face-down piece on b3, and both engines put Black well ahead.

4. Game 4: AB-JChess vs jqe60 moves

   Game 4 of the post: 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 board faces the winner, jqe (Black). The graph is both engines' chance for Black, AB-JChess teal and jqe orange. Wherever the two engines w…

   AB-JChess, with Red, moves the cannon from h6 to h9 here; jqe would turn over Red’s piece on h1 instead. Both engines expect Black to turn over d10 next, so the split is about how each values a board with many pieces still face down.

5. Game 5: jqe vs AB-JChess114 moves

   Game 5 of the post: one of 600 games between AB-JChess-20261031 and jqe on 2026-10-31, 4 seconds a move on 4 threads. jqe has Red. The game is drawn; the board faces Black, whose chances AB-JChess read first at the marked move. The graph is both engines' chance for Black, AB-JChe…

   jqe, with Red, moves the chariot from f3 to d3 here; AB-JChess would move the other chariot from a10 to f10 and trade chariots at once. The game follows jqe’s line move for move from here.

6. The chase rule: AB-JChess vs jqe109 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.