The reason why it is '+9' is that the computer cant caluclate a mate, but it thinks they are winning because of the material advantage. It finally realises at like 25 bishops
Take notice, that is the fundamental truth! Whenever the engine rates any position at +xx.x it merely says "I think white will win but I'm not sure!" It may be sure though it can get at least a draw but it can't tell you both things in one output number - without mathematical trickery.
If you know your basic endgame theory you will know that two opposite color bishops can mate a lone king. However, two same squared bishops cannot.
Use the tablebase. It will give you the true evaluation of any position with 7 pieces or less on the board.
If you know your basic endgame theory you will know that two opposite color bishops can mate a lone king. However, two same squared bishops cannot.
Use the tablebase. It will give you the true evaluation of any position with 7 pieces or less on the board.
Yes, and you can have 20 pieces on the board and it's still insufficient mating material:
Engine says +100 but it's a draw bishop and wrong rook pawn
Wouldn't matter if it was the right rook pawn. The 32 Bishops are landlocked and can't move, and so neither can the pawns. Put then on h6 and g7 and it is still a draw.
Weirdly enough this game did not end in a draw.
https://www.chess.com/game/live/2449103502?username=fryedk
It was a game in Nov 2017.
White has no time in the clock, so he lost… If he had timer in the clock, he would never be checkmated.
Per both FIDE and US Chess rules, if there is no legal series of moves that can end in checkmating your opponent then if your opponent flags it is a draw. Chess.com was only counting pieces, not noticing that having both Bishops traveling on the same squares made checkmate impossible to achieve (another example is Chess.com willing to award a win to the unflagged player in White Ke1, Ph4, Pf4, Pc4, Pa4 vs Black Ke8, Ph5, Pf5, Pc5, Pa5 - both US Chess and FIDE would call it a draw because checkmate is impossible).
Chess.com has always been programmed incorrectly.
The following, White has 8 Queens and Black is in check, but if Black fell asleep or has the runs and his flag falls, it's a draw.
In a position where the player who runs out of time but has no choice but to checkmate thenother player next move, it's a draw. He ran out of time, but has no way of losing the game given unlimited time. However he didn't find the win, so it cancels out to a draw. What chess.com programs incorrectly is that a player who runs out of time gets a draw, even if he's forcibly mated next move, if the opponent only has mating material that would be insufficient given a lone king:
Black can deliberately let his time run out before moving the pawn and the site will give him a draw, unbelievable.
Btw, it wouldn't be unreasonable to declare a win which is inevitable after a flag fall. I do not mean a forced win but an inevitable checkmate as in post #28. I recall some problemists creating inevitable checkmate positions like in 7 moves some 50 years ago. Apparently anticipating a rule change to include this variation of inevitable outcomes. But it never came!
Btw, it wouldn't be unreasonable to declare a win which is inevitable after a flag fall. I do not mean a forced win but an inevitable checkmate as in post #28. I recall some problemists creating inevitable checkmate positions like in 7 moves some 50 years ago. Apparently anticipating a rule change to include this variation of inevitable outcomes. But it never came!
It is not just inevitable checkmates. Here is an inevitable stalemate!
If either flag runs out, the following should be a draw as there is no legal sequence for either player to win.
Right now, it is Black's move. If EITHER player flags at any point, chess.com would grant the one with time a win.
Both USCF and FIDE, this is a draw as there is no legal sequence of moves for either king to be checkmated.
Only legal move for both players is Qxh6+ until it is time to capture the last Black Queen, at which point White has 2 legal moves. Kxh6 and Rxh6. Both are Stalemate.
Yes, it should depend on whether any sequence of legal moves can lead to checkmate. Regardless of if it turns a winning players win into a draw or a losing players loss into a draw, it's fair. What isn't fair though, is any system that allows a player to improve his game result and gain half a point by deliberately losing on time, such as the positions I showed above.
eric0022 escreveu:
I know it’s a draw, but the engine gives white +9
I think the engine simply counts the material White has as "two bishops". So it dishes out a +9.
EDIT: I ran it on the free stockfish program for non-site members at depth 20 and it's only +6.10.
The weird thing is:
It’s also a draw, and black has LOTS of material, but the engine gives 0.0