The Checker Maven

Three Wrongs, One Right

Two wrongs don't make a right, we're told, and if so, surely three wrongs don't, either. A third wrong will only lead to even more trouble--- or in the case of our game of checkers, a loss--- and that leads us to this week's four-fold problem.

We'll look at a published game from years back, in which three wrongs weren't counterbalanced by a right (until today, at least).

 1 11-15 22-18 2 15x22 25x18 3 12-16 29-25 4 10-14 24-19 5 8-12 26-22 6 4-8 18-15 7 16-20
BLACK

WHITE
White to Play and Draw

W:W15,19,21,22,23,25,27,28,30,31,32:B1,2,3,5,6,7,8,9,12,14,20.

At this juncture, White played 23-18, and annotator Gary Garwood called it a weak move. He suggested instead 31-26 or 22-18. But these moves are just as bad. All three of them lose. Three wrongs, no right. But in fact there is a right move and White can obtain a draw here.

Can you find the correct move to draw for White, and then (for extra credit, if you will) show the Black wins for all three incorrect moves? It's a tall assignment, but one that will give you quite a bit of checker insight.

When you're right (and you know it, as the saying goes) do the right thing by clicking your mouse on Read More to see the solutions.

Solution

First we'll look at the move actually played, 23-18:

 7 ... 23-18 8 14x23 27x18 9 7-10 32-27 10 3-7 28-24 11 9-13 21-17 12 5-9 31-26 13 7-1

White hasn't got much left to play; 25-21 allows a 2 for 1 with 9-14.

 13 ... 26-23 14 1-5 25-21

Stopping one 2 for 1 simply allows another.

 15 9-14 18x9 16 11x25 17-14 17 10x17 21x14 18 8-11 30x21 19 11-16 19-15 20 16-19 23x16 21 12x28

Black Wins.

 7 ... 31-26 8 7-10 22-18 9 9-13 18x9 10 5x14 26-22 11 1-5 23-18 12 14x23 27x18 13 5-9 30-26 14 10-14 26-23 15 2-7 32-27 16 7-10

White has no safe moves and must lose a man, e.g. 28-24 17. 12-16 19x12 18. 10x26 Black wins.

Maybe 22-18?

 7 ... 22-18 8 7-10 25-22 9 12-16 19x12 10 10x26 30x23 11 8-11 27-24 12 20x27 31x24 13 9-13 18x9 14 5x14 24-20 15 11-15

White's position looks anemic.

 15 ... 32-27 16 6-10

White now has nothing good.

 16 ... 27-24 17 2-7 24-19 18 15x24 28x19 19 14-17 21x14 20 10x26

Black wins.

The way to a draw goes like this:

 7 ... 28-24! 8 9-13 15-10 9 6x15 19x10 10 8-11 24-19 11 11-15

Careful; 2-6 would lose to 19-15.

 11 ... 32-28 12 15x24 28x19 13 5-9 19-15 14 2-6 27-24 15 20x27 31x24 16 12-16 15-11 17 6x15 11x2 18 16-20 23-19 19 20x27 19x10 20 27-31 2-7 21 31-27 7-11 22 27-23 11-16

Etc. It's a draw with careful play on both sides.

How did you do on this one? We wouldn't call it easy, and we don't think we're wrong!

10/20/18 - Category: Games - Printer friendly version