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Member since Jan-08-06 · Last seen May-29-17
I mainly compose chess problems these days. Please visit to see a selection of my compositions.

This problem first appeared in The Problemist Supplement, July 2009.

Mark Thornton (after Tibor Orban). Dedicated to Etienne Dupuis, author of Euclide, a program for solving and composing proof games.

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Position after White's 7th move. How did the game go?

It is based on this famous problem by Tibor Orban, Die Schwalbe, 1976 (Commended)

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Position after Black's 4th move. How did the game go?

Solution to Orban's Problem: 1. e4 e6 2. Bb5 Ke7! 3. Bxd7 c6 4. Be8 Kxe8

Solution to my problem: 1. Nh3 d5 2. Nf4 Bg4 3. Nxd5 Bxe2 4. Nxe7 Bb5! 5. Bxb5+ Kxe7 6. Be8 Kxe8 7. O-O

White's 7th move rules out the following possibilities: 1. Nh3 d5 2. Nf4 Bg4 3. Nxd5 Bxe2 4. Nxe7 <Bxf1> 5. Kxf1/Rxf1 Kxe7/Bxe7/Nxe7 6. Ke1/Rh1 Ke8/Bf8/Ng8

>> Click here to see MarkThornton's game collections.

   MarkThornton has kibitzed 2567 times to chessgames   [more...]
   Nov-08-16 L Dominguez vs A Giri, 2011
MarkThornton: My best guess is that White's phone went off before he played his 5th move.
   Feb-12-16 Euwe vs Alekhine, 1935
MarkThornton: This was game 22: Euwe had just won 2 games in a row, including his first win with Black, to level the score at 10.5-10.5
   Feb-05-16 G Friedemann vs Keres, 1940
MarkThornton: After 28.N moves, Black has 28...Nb5 or 28...Nd5 attacking both Qc7 and Re1. Hence. White tries 28.Qxc6, as the lesser of two evils, but resignation would have been more polite.
   Feb-05-16 J Yrjola vs E Hintikka, 2006
MarkThornton: An interesting game, which fizzled out into a draw when all the major pieces were exchanged.
   Jan-23-16 Petrosian vs I Zaitsev, 1966
MarkThornton: this game seems to be a duplicate of Petrosian vs I Zaitsev, 1966
   Jul-31-15 Menchik vs G A Thomas, 1930
MarkThornton: I may be wrong, but I think the first time control was often at move 30 in that period.
   Aug-12-14 The World vs Naiditsch, 2014 (replies)
   Aug-12-14 RandomVisitor chessforum (replies)
   Jul-01-14 Speelman vs A D Martin, 1982
MarkThornton: I remember watching this game in the Commentary area of the British Championships. At first, no-one believed this sacrifice, but then we all began to realise that Black had no defence....
   Jul-01-14 Chandler vs Speelman, 1985 (replies)
MarkThornton: I was fortunate to be a spectator in the audience that was watching this game, as it unfolded. 19....Nf3+ caused a sensation, and I remember trying to calculate all the variations.... But it soon became clear that Black was winning in all variations. One of Speelman's best ...
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