00:00look at few studies just to show how it works in the endgame when changing
00:08pieces could lead to a decisive advantage for one side or to be a
00:15defensive mechanism to save the game that looks otherwise desperate here we
00:21have a first study and it's an endgame what is an extra piece but our pawn
00:28is under attack and our might is under attack in the middle game or in the
00:36opening you definitely have to pay attention to this threat because knight
00:41is more valuable at the pawn but we're in the endgame so protecting the knight
00:46doesn't do us any good if we protect the knight and black takes the pawn that's a
00:50theoretically drawn position rook and knight cannot win against a lone rook so
00:56but how can we benefit from keeping this pawn alive because it's not simply a
01:02pawns endgame where pawn is rushing likes it has a rook and this rook can just go
01:07around and stop our pawn the trick is that we play a quiet move a3 doesn't
01:16seem logical black simply takes a knight with a check but then king g2 and
01:20surprise surprise the rook that has so many moves cannot avoid the exchange if
01:27rook goes back on h1 or g1 then rook d1 will change rooks and our pawn is
01:34unstoppable while the black pawn can easily stop because our king is too close but
01:40instead of moving to the first rank rook h1 or g1 black rook can go back to f4 and
01:46and then we understand why our pawn moved not to a4 but to a3 sometimes it's very
01:53important you make a just a small move one square but
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