Lucena position

Sharrocks
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The Lucena position is an endgame position named after Luis Ramirez de Lucena.

In this position, obvious white attempts fail. For example 1. Rd2+ Ke7 2. Kc7 Rc1+ 3. Kb6 Rb1+ 4. Kc6 Rc1+ and white can't make any progress. If white moes his king too far away from the pawn, black can attack it and/or win it with his rook.

The solution is also known as "building a bridge". White needs his rook to block the checks. 

After 1. Rd2+ Kd7 2. Rd4! white's rook is too far from the black king to attack, but close enough to assist the white king. After for example 2... Ra2 3. Kc7 Rc2+ 4. Kb6 Rb2+ 5. Kc6 Rc2+ 6. Kb5! the plan behind 2. Rd4 becomes clear: the rook will block the checks when the pawn can't be stopped anymore. So after 6... Rb2+ 7. Rb4 black can resign.

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