hgm wrote:You seem to miss the point. The position is not a win, but a draw. And both engines saw that correctly.
So the relevant question is: if the position is a draw, why declare a win?
as said, it is a tb win in 72 moves. engines go to move 50, 100 plies no captures, pawn moves, so 0.0 is returned, and with that the game ends for the engines. However, 22 moves later on, the win arrives. you know that much better than me, so I wonder why you take this stance.
if you mean, TCEC adjudication rules are not clear enough, that certainly migth be the case, though the position is still won for white.
That is what TCEC rules state regarding Adjudication:
A game can be drawn by the normal 3-fold repetition rule or the 50-move rule.
However, a game can also be drawn at move 40 or later if the eval from both playing engines are within +0.05 to -0.05 pawns for the last 5 moves, or 10 plies. If there is a pawn advance, or a capture by any kind, this special draw rule will reset and start over. In the website this rule is shown as "TCEC draw rule" with a number indicating how many plies there are left until it kicks in. It will adjudicate as won for one side if both playing engines have an eval of at least 6.50 pawns (or -6.50 in case of a black win) for 4 consecutive moves, or 8 plies - this rule is in effect as soon as the game starts. In the website this rule is shown as "TCEC win rule" with a number indicating how many plies there are left until it kicks in.
Cutechess will also adjudicate 5-men or less tablebase endgame positions automatically.
Problem is, how do you reconcile 1) the 5-fold scores within 0.05/-0.05 of both engines, with 2) the adjudication by Cutechess of tablebase positions?
Both drawing factors actually occured in the game, but I guess Cutechess adjudicated before the draw according to the special TCEC drawing rule could come into force. Anywhere written that GUI adjudication takes precedence to the special TCEC drawing rule, or this occurs automatically due to some technical stuff?
In any case, for me it would be wrong to adjudicate an objectively won position as a draw.