Can You Explain White's Winning Plan?

This is another puzzle from the great Zinar. Can you find white's winning plan? Can you explain why that first move works when similar ones don't?

5K2/2p5/8/2k5/8/2P5/4P3/8 w - - 0 1

Comments (10)
No. 1-10
Alena
Alena

Yancey, I studied your positions and I understood the difference between them. In the first variation the white queen could move to g5 with the check and in the second variation couldn't. The king blocked the way. Qg5 was the only move to win in the first variation.

Yancey_Ward
Yancey_Ward

Editor

Here are the two critical positions: 4Q3/8/5K2/8/8/2p5/3k4/8 w - - 0 1 and 4Q3/5K2/8/8/8/2p5/3k4/8 w - - 0 1. The first is a draw with best play, the second is a win for white with best play. Why?

Yancey_Ward
Yancey_Ward

Editor

Yes, but what was the critical difference- why did the pawn reach c2 in one line and not the other?

Alena
Alena

I considered your two lines 1.Kg7 Kd5 2.Kf7 and 1.Kf7 Kd5 2.Kf6.
They look similiar but they don't. In this varition 1.Kf7 Kd5 2.Kf6 only a draw because the black pawn reached c2. On the other hand in this varition 1.Kg7 Kd5 2.Kf7 the black pawn didn't reach c2 and it's a win. Although in both varitions the white queen on e8.

Yancey_Ward
Yancey_Ward

Editor

I meant, "where white has queened at e8". Alena, open this thread for an important message.



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