Monday, 2 December 2013

The earliest perpetual

Imagine you are looking for a quick draw (as is your opponent), but you are playing under the Sofia/Corsica/No agreed Draws before move X rules. From the starting position, what is quickest way to draw by perpetual check? (NB Both sides have to co-operate to get to the position, and if you did it in a real game, you would run the risk of a double default!)


Chris Skulte said...

Benko Gambit you can claim at move 17, but it is forced before that.
1. d4 Nf6
2. c4 c5
3. d5 b5
4. dxb5 a6
5. b6 e6
6. Nc3 exd5
7. Nxd5 Nxd5
8. Qxd5 Nc6
9. Bg4 Qxb6
10. Qe4+ Be7
11. Bxe7 Nxe7
12. Qxa8 Qxb2
13. Rd1 Qc3+
14. Rd2 Qc1+
15. Rd1 Qc3+
16. Rd2 Qc1+
17. Rd1 Claim-Draw (Qc3+)

Anonymous said...

The quickest I can come up with is:
1. e4 e5
2. f4 Qh4+
3. Ke2 Qg4+
4. Ke1 Qh4+
5. Ke2 Qg4+
6. Ke1 write down Qh4+ and claim draw

Anonymous said...

A fairly well known line in a popular opening ...
Haydn Barber vs Leon Kempen
Canberra Club Championship Rd 9 - 19 April 1978
1. e4 e5
2. Nf3 Nc6
3. Bb5 a6
4. Bxc6 dxc6
5. O-O Bg4
6. h3 h5
7. c3 Qd3
8. hxg4 hxg4
9. Nxe5 Bd6
10. Nxd3 Bh2+

Anonymous said...

1.d4 d5 2.c4 dxc4 3.e4 Nf6 4.e5 Nd5 5.Bxc4 Nb6 6.Bb3 Nc6 7.Nf3 Bg4 8.Ng5 Bxd1 9.Bxf7 Kd7 10.Be6

Anonymous said...

Perpetual check is a tactic, rather than a rule of chess. The applicable rules are threefold repetition of position and the 50 move rule. So I'm not really sure how to go about answering this question. Does the "perpetual" have to be 100% forced, i.e. unavoidable with legal moves by the player being checked?

Shaun Press said...

To be honest it was a strange question. On the one hand the repetition was forced (eg the opponent could not stop it), but before that, the two players had to co-operate to reach the position.
The answer I had was 1.f4 e5 2.Kf2 Qf6 3.Qg3 and Black can now force a perpetual with Qxf4+