look at the move of the white king in this game:
http://fr.lichess.org/aNPmFTTp/black
from move 27 to 35, he describes a curve around his rook and pawn, from a3 back to a3. But at the end, black pawn a5 blocks his way
http://fr.lichess.org/aNPmFTTp/black
from move 27 to 35, he describes a curve around his rook and pawn, from a3 back to a3. But at the end, black pawn a5 blocks his way