Give up the bishop pair when you're up in material?

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Kowarenai

well yeah its a good idea as long as you dont blunder that piece advantage lol

Stil1
tygxc wrote:

#23
Stockfish says +0.9

My advice: don't blindly trust engine eval scores, especially in the opening. The scores tend to change, as the game moves on (even when all the top-choice moves are played).

This is something many players learn the hard way, while doing opening prep. Sometimes a move may look bad (or even losing), based on the eval score. But the eval score isn't always correct. The farther down the line you play, the more things tend to change.

(I believe this has something to do with the "horizon effect", though those who understand engines would know far more about this than I would.)

 

Anyway, here's Stockfish 14 NNUE playing against itself from that position, on my computer, at Depth 25:

Here's the eval change from the starting position, to the final position at move 11:

Starting Position Eval Score: +0.9 (white has a clear advantage)

Ending Position Eval Score: +0.5 (game is roughly equal)

 

Now we can ask: "What's going on here? Isn't the bishop pair winning by default?"

I'd say a reasonable conclusion for us to draw would be: "no", and also: "it depends".

In some positions, the bishop pair would be a winning advantage. In other positions, the knight pair would be a winning advantage. In other positions, still, it wouldn't matter either way.

It all depends on the position.