Should this be a draw?

https://www.chess.com/analysis/game/computer/105385326?tab=review

On the last move of this game, i promoted my pawn to a bishop and chess.com claimed a draw by insufficient material even though i had 2 bishops on the board. I am aware that it is not possible to force a checkmate with 2 bishops of same colour but if the king voluntarily walks to the corner, then it is possible. Analysing this with an engine claims that white is winning. We should be given an opportunity to flag our opponent or try to trick them into running to the corner (typical 200 elo player). Idk, I'm just curious on what you guys think on whether or not this should be a draw right away and why/ why not.

Thanks for reading!

It's impossible to checkmate with two bishops of the same color even if the opponent cooperates, unless your opponent has other material to block themselves in

Ah thx, i wasnt aware of that. But what about the possibility of flagging?

Flagging wouldn't matter. You can only win on time if you have sufficient material to mate and two bishops of the same color are not sufficient vs a lone king.

Lol I didn't realise that both bishops were on the same diagonal and it's lot of fun to checkmate with 2 bishops so I underpromoted

Oops!

https://www.chess.com/analysis/game/computer/105385326?tab=review

see final move

You can't be checkmated by a K and two Bs on the same colour. There isn't a possible checkmate position.

The engine's assessment is faulty programming.

Yeah i want aware of this when I had made this post and someone had pointed this out earlier.

Sharp eyes!

I found out that someone HAD made that comment and edited my post but too late. Sorry.

The engine's assessment is very misleading and it's no wonder that you thought you'd been diddled.

Why didn't you promote to a knight

I had completely missed the fact that the 2 bishops were on the same colour so I didn't think that it would draw.

They finally corrected the outcome. I am aware of one old game in which a similar endgame ended in a win for the side having two bishops on the same coloured square (nothing else than the two bishops and the two kings on the board).

The engines assessment is not faulty. It is evaluating your last move to promote to a same-color bishop as a mistake. The correct line it is refering to in saying that white had winning chances was if the pawn was promoted to Q. It is considering your last decision to under promote not the pieces on the board after the under promotion.

When it is KBB of the same color vs K, the K will always have a escape square to move to. Your memory is not clear.

There is no possible position that can be checkmate so that's impossible.

Probably the arbiter was a bit thick and there should have been a complaint against him or her.

When I looked at it myself I think it was +8.3 for the side with the two bishops! Since the position is actually 0.0, the assessment is faulty. The engine does not evaluate a position by deleting your last move and substituting a better one, you daft 'apeth. That's certainly a bold blunder, to think that.