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MatPlus.Net Forum General Six-fold square vacation by white king

### Six-fold square vacation by white king

In 1942, Veikko Salonen (1919-1992) published this, which is in FA 1914-44, P1055898. (The source there is wrong.) It shows six white square vacations by the white king (threat inclusive) and four variations are bi-valve. The 1...Ne2 variation is an obstruction, I suppose, although also a line injury, if you allow.

(= 6+13 )

3#; Aamulehti 15.3.1942, 3rd pr. SSL 1938-42 (must have been a ring tourney)

The position is not so pleasing to the eye and the key (1.Ne8! threat 2.Kd8) brings the out of play knight into play, but is there a better six-fold rendition?

He had published earlier versions, P1223761, Tidskrift för Schack, 2nd pr. 1936, and yacpdb 462296. It's interesting to see how a not-too-great a composer gradually worked his way up to the best that he could find.

It is necessary to say this problem presents complete duel between white King and black knight, so this fact raises the value of the problem itself.

A very nice problem but the construction is not optimal. If we put a white Rook on b7, we can remove Bb8 and Pa7 (5+13 pieces, C+).

(4) Posted by seetharaman kalyan [Wednesday, May 15, 2019 18:12]

Superb problem. Surprising the obvious improvement was missed. Kudos to master Petkov for noticing it immediately.

Depends on your definition of economy. E.g. in the reconstruction column in Probleemblad, a white pawn(2)+bishop(4) is cheaper than a white rook(7).

@Petko: My immediate idea too. THX for relieving me from cook checking :-)
What annoys me much more is the Pb6 (no chance to get rid of it, 1...e2!)
and the Pb5 (only protects Pa6 against mobbing).

Here is a similar setting, which was also selected for the FIDE Album.

Nils G.G. van Dijk
2nd Prize, Main Post 1958
(= 7+14 )
#3
1.e8=S! (>2.Kd8 >3.Sc7)
1...Sg6 2.Kxd6
1...Sf3 2.Kc8 (2.Kxc6?)
1...Sf5 2.Kd7 (2.Kc8?)
1...Sg2 2.Kxc6
1...Be2 2.Kxb6

The final variation is by a different black piece, with White having to allow for 2...Bxa6.

The following one is a bit different.

Antti G. Ojanen
4 Comm, V.Marin y Llovet MT 1942-43
(= 7+10 )
#3
1.Se7! (>2.Kd7 >3.Sc6)
1...Bc5 2.Kxc5
1...Bb6 2.Kxb6
1...Rf1 2.Kxd5
1...Rf2,Re3 2.Kd6
1...Rd3 2.Kxb5

Perhaps the following problem holds the record, with 7 (or 8?) square vacations.

Theodor Siers (in memoriam G.Hume)
British Chess Magazine 1938 (v)
(= 12+6 )
#3
1.Bf6! (>2.Kxb7 >3.Sc6)
1...Rb8 2.Kd6
1...Ra7 2.Kxc5 Rc7+ 3.Sc6
1...Rxb5 2.Kxb5 (>3.Sc6,Sg6,Sef3,Sec4)
1...Rxd7 2.Kxd7
1...Rc7+ 2.Kxc7
1...Rb6+ 2.Kxb6
1...Bxd5+ 2.Kxd5 f4,fxg4 3.Sc6

The 1...Rxb5 variation does not really feature a square vacation, because 3.Sc6 is not forced.