A Former Loophole-The “Legal” Triple Check

[Tristan Clayton]

An en passant capture that leads to triple check is ineed not too hard to set up as you suggested.

Checkmate In 2 Moves
3r4/3B3N/4n3/3K1k1P/2pp2p1/3r1bP1/2Q1PR2/8

I’m intrigued to know which move led to this position.

...ah, B (g2/h1) x f3 +

Saw it as soon as I’d posted!

[Jonathan Bryant]

I know you can post images directly on the forum but I don’t know how you do it from a tweet. If anybody can show me the way forward I’ll save everybody a mouse click.

Here we go (thanks to Justin):-

[Rewan Demontay]

One last thing-Here is a problem in which the king is left in a quintuple check in the final position!

Mate In 4
Dedicated To Marken Foo (a personal friend)
1RnkBB2/2p5/8/4K1Nr/4N3/6R1/1n5q/bQ2r3
1. Qd3+! Nxd3+ 2. Ne6+ Kxe8 3. Nf6+ Kf7 4. Rg7#

[Andrew Buchanan]

I feel sad that Dr Robert Norman who originated this whole gloriously silly idea did not get to name what became known as the Bosma condition. I've read the biography of his father (linked earlier in this thread), but would appreciate some more biographical details of the son, who died quite young, particularly since I spent some time in Dar Es Salaam myself in the nineties. I don't suppose anyone here knows more about him?

Many of the Bosma condition problems from the 1990s are unsound, and I have found fixes for most. Norman's intended solution doesn't work due to Bosma counterplay by Black (see https://pdb.dieschwalbe.de/P1377131), but White still wins we think, through rather messy play. The Kristiansen #4 is too simplistic. I really want a version of Norman's which shows both the basic idea and the thematic counterplay, and then has a clean finish. Working on it.

There's also a bunch of new problems which have been composed recently. I may put a little article together on the subject, including all the fixes, which would pay due tribute to Dr Norman - if only I could find out more about him?

Thanks,
Andrew

[Simon Rogers]

Welcome to the forum Andrew.

[Rewan Demontay]

Yes, welcome Andrew! It's good to have you here, my friend.

[Andrew Buchanan]

Thank you chaps! Nice to be a member of this very interesting forum

[Rewan Demontay]

Addendum:

Everything I've said in this thread, and a bit more, can be read neatly in a row here: https://chess.stackexchange.com/questio ... 9992#29992

The original source of Bosma Chess, the fairy induction of the triple check, can be read here, introduction and award, in Dutch from Probleemblad: https://archive.org/details/bosma-chess

Triple check problems in general, as well as the above linked ones, can be viewed online here, under the keyword "Bosma": https://pdb.dieschwalbe.de/search.jsp?e ... 27bosma%27