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Copyright 1991,1996, 1997, 1998 John Richard Coffey.
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0 [Next]	White to move This is from a youtube video Chess Endgame: Changing the Base of the opponent's Pawn Chain.
1 [Next]	For reasons that we will see shortly, a4+ is better than Kc3. White to move
2 [Next]	Here the video does not give the best move. White to move
3 [Next]	The main ideas ares as follows: If white goes after h7 pawn he loses the pawn race because black will go after f2. By playing g4! white can change the base of the pawn chain from h7 to f5, in which case he wins the race. If black takes the pawn on g4, it is worse for him. By playing g4! now instead of later, he forces black to waste a move because White has opposition.

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