- 17 Sep '06 19:33 / 4 editsDid you notice White has three rooks?

In a proof game the moves need only be legal - they do not have to make any sense as moves in an actual game.

Anyway, what would you play in this position (you are white and it's your turn):

And a set of little challenges (but don't forget BDP's problem!)

Find positions with minimal number of chessmen where:

1. Knight promotion is the only winning move;

2. Rook promotion is the only winning move;

3. Bishop promotion is the only winning move;

4. Knight promotion is the only drawing move (solution above);

5. Rook promotion is the only drawing move;

6. Bishop promotion is the only drawing move.

The best solutions I know of are as follows:

Challenge no. 1 - 4 pieces;

Challenge no. 2 - 3 pieces;

Challenge no. 3 - 5 pieces;

Challenge no. 4 - 4 pieces;

Challenge no. 5 - 7 pieces;

Challenge no. 6 - 6 pieces.

Can you find the positions? - 17 Sep '06 20:38

f8=N+*Originally posted by David113***Did you notice White has three rooks?**

In a proof game the moves need only be legal - they do not have to make any sense as moves in an actual game.

Anyway, what would you play in this position (you are white and it's your turn):

[fen]4K3/r4P2/4k3/8/8/8/8/8[/fen]

And a set of little challenges (but don't forget BDP's problem!)

Find positions with min ...[text shortened]... ieces;

Challenge no. 5 - 7 pieces;

Challenge no. 6 - 6 pieces.

Can you find the positions? - 18 Sep '06 06:24 / 2 edits

Here's the first three:*Originally posted by David113*

And a set of little challenges (but don't forget BDP's problem!)

Can you find the positions?[/b]

1. Knight promotion is the only winning move;

wKf5 Bg6 Pg7; bKh6.**1.g8N+!**

2. Rook promotion is the only winning move;

wKa5 Pc7; bKa7.**1.c8R!**

3. Bishop promotion is the only winning move;

wKb4 Nd5 Pb7; bKa6 Pa7.**1.b8B!**

The queen was left off the list, because that task isn't possible with 3 units, and trivial with 4 units. - 19 Sep '06 21:01

Seems there are multiple solutions for this one.*Originally posted by David113*

And a set of little challenges (but don't forget BDP's problem!)

Find positions with minimal number of chessmen where:

4. Knight promotion is the only drawing move (solution above);

Can you find the positions?

wKh5 Pe7; bKf6 Qg7

Menaced with ...Qg5#, White's only escape is**1.e8N+**, winning the Queen and drawing. - 19 Sep '06 21:21 / 3 edits

I can beat this by 2 units.*Originally posted by David113*

And a set of little challenges (but don't forget BDP's problem!)

Find positions with minimal number of chessmen where:

5. Rook promotion is the only drawing move;

The best solutions I know of are as follows:

Challenge no. 5 - 7 pieces;

wKc1 Ph7; bKa1 Pa2h2.

Of course, White can win (1.h8Q#, 1.h8B# ) or lose (1.h8N, 1.K~) but only**1.h8R**h1Q+ etc. draws. - 19 Sep '06 21:33

Using my idea from challenge #5, I can do this one with a mere 4 units.*Originally posted by David113*

And a set of little challenges (but don't forget BDP's problem!)

Find positions with minimal number of chessmen where:

6. Bishop promotion is the only drawing move.

The best solutions I know of are as follows:

Challenge no. 6 - 6 pieces.

wKc2 Pa7; bKa1 Ph2.

**1.a8B**is the only drawing move.