when should we make captures or exchange material ?
only when it suits us
only when the value of the exchange is right
values of all the pieces change during the game - capturing a piece which saves the game
is very important
mate with a Knight and Bishop (with the King's help, can be forced but very hard (in unfavourable
positions can take up to 34 correct moves)
so taking the pawn
3.Nc7 Kh8 4.Nd5 Kg8 5.Ne7+ Kf8 6.Kh7 Kxe7 7.g7 Kf6 8.g8Q and it turns into a BASIC mate
though there is a forced mate-in-6 moves
3.Kg5 Kh8 4.g7+ Kh7 5.Kf6 Kg8 6.Ke7 Kh7 7.Kf7 Kh6 8.g8Q Kh5 9.Qg5# checkmate
1...Qxg6+ 2.Kxg6 Kg8 3.Nf5 Kh8 4.Kf6 Kg8 5.Ke7 Kh8 6.Kf8 Kh7 .
note that checkmate with just the 2 knights cannot be forced so it is OK to capture the pawn
33.Rxd4 a sacrifice - white saw the value of the Knight check after the recapture cxd4
34.Ne7+ this is the correct way to play, since 34 Qxc8 ..Qxc8 35 Nxc8 + seems the same
but in fact the difference is that in this variation black's d-pawn can Queen safely (and so black would win)
but in what was played, white can capture that pawn and his better pawns (probable 2 passed pawns will force the win
Qxe7 35.Qxc8+ Qf8 36.Qxf8+ Kxf8 1-0