Originally posted by MontyMoose
Yes, thumbs up.
I have this mantra in my head after reading some GM: "If you take, it's a mistake". The two-fold reasoning being that you capturing an enemy piece might allow your opponent to develop another of his pieces via recapture (your developed piece and the enemy's counterpart have disappeared only to be replaced by an enemy developed piece 😳 to collect your just rewards, but those people who know what they are doing have patience.
(White has just played fxg6)
Lets look at it. 🙂
If white played fxg6 what happens?
Pro's
1. He wins a piece (obviously). So that's definitely a plus.
2. The f- file is opened, giving the Queen on f2 more scope.
3. When black recaptures, he will have a doubled pawn.
Con's
1. White loses control of e6 and g6.
2. f5 is no longer blocked by a pawn, so potentially something else can occupy that square. Not necessarily a problem, but worth taking note of.
3. After the capture on g7 the black Queen has horizontal movement.
4. Black can recapture with the f-pawn, opening the f file in his favour. Very dangerous for white.
5. With an open f-file, black can play Nf4 as the Rf8 and Qe5 are both covering that square.
What does this look like?
Black is a piece down, but he has counter play down the f-file.
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So, what about the move that was played?
(White has just played g4)
Pro's
1. Another piece is attacked, the knight on h5 has to move.
2. The pawn on f5 is properly defended again.
3. When the knight moves, it only has one safe square (f6) and therefore the pawn can continue on to g5 at some point, potentially opening up lines to the black King.
4. If black plays ..Nf6, then white develops his bishop with a tempo, Bf4.
All very promising.
Con's
1. f3/f4 and h3/h4 can no longer be defended by pawns.
2. After ..Nf6, the black knight is better placed and combine with the Queen to attack e4. It's not an immediate threat, but after a rook comes to e8 it is, therefore black wins a tempo by playing his rook to the centre. But is this a threat?
(Copied in here from below for clarity...)
[FEN "r4rk1/p1p2ppp/3p2b1/2p1qP1n/4P1P1/2N4P/PPP2Q2/R1B1R1K1 b - - 0 18"]
19...Nf6 20.Bf4 Qe7 { If Qe8 then after Nd5, Nxc7 will become a threat} 21.Nd5 { Black doesn't have time to capture on e4 because his Queen is attacked and the capture comes with check... }
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All things considered, i think it's definitely better for white to delay capture. The Bishop isn't going anywhere. Maintaining a pawn on f5 as opposed to allowing the opening of the f file helps white a lot more then the immediate capture. Black has to find activity on his move. After fxBg6 fxg6, the black rook is involved and black can still dream of generating threats down this now open file.