Philidor position

It is another famous and important position in chess endgame theory, also known as the third rank defence. The weaker side holds the draw if the following conditions are met:
- the defending King is on the promoting square of the opposing pawn (or adjacent to it)
- the opposing pawn and King have not yet reached the sixth rank for white (third rank for black)
- the defending Rook holds the control of the sixth rank for white (third rank for black)
The stronger side cannot make any progress. If the pawn advances to block the defending Rook's control over the sixth rank for white (third rank for black), that said Rook moves immediately as far behind the pawn and King as possible and will be able to hold the position with perpetual checks. Any Rook exchange would lead to a simple King + pawn vs King drawn endgame.

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