Big Square Rule:
![\"\"](\"https://roichessacademy.com/wp-content/uploads/sites/22/2020/05/big-square-rule-1.jpg\")
![\"\"](\"https://roichessacademy.com/wp-content/uploads/sites/22/2020/05/big-square-rule.jpg\")
From the above positions you can see the formation of a big square. The defending King is out of the Big square shown in position (b). pawn on c4 reaching c8 to promote Queen. c5-c6-c7-c8 total 4 squares to be Queen, count the squares from pawn to black king side in horizontal direction i.e, d4-e4-f4-g4 total 4 squares make a square. The defending king is out of the winning zone or out of Big square.
White to play:
Black king is out of the winning zone or big square.
1.c5 Kg5 2.c6 Kf6 3.c7 Ke7 3.c8=Q +-
Rook Pawn:
![\"\"](\"https://roichessacademy.com/wp-content/uploads/sites/22/2020/05/rook-pawn.jpg\")
Rook pawn is exceptional for all the other pawn endings.
Here we can see the King on 6th rank ahead of the pawn but still its a draw because of Rook pawn which leads to stalemate.
White to play:
1. Kb6 Kb8 2.a6 Ka8 3.a7 stalemate.
Black to play:
1… Kb8 2.Kb6 Ka8 3.a6 Kb8 4.a7+ Ka8 5.Ka6 stalemate.
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