Larsson theme

A helpmate with identical final positions in set play and actual play with exchanged squares (or existence) of two pieces of the same kind and color.

See also: Place exchange in the final positions.

Larsson, Bror

Schachmatt, Stockholms Problemschackklub TT, 1949

4th Prize

Example: Larsson theme
h#2*  (3+3)

1...Se3 2.cxb1=R Sc2#

1.cxd1=R Sa3 2.Rb1 Sc2#

Exchanged existence of wSb1 and wSd1.

View in Helpmate Analyzer

FEN: 8/8/8/8/8/2K5/p1p5/kN1N4

External links:

Fuhlendorf, Gerhard

Deutsche Märchenschachzeitung, 1931

1st Prize

Example: Larsson theme
h#3*  (6+5)

1...Rxd4 2.Kc5 Rh5+ 3.Kxd4 Rd5#

1.Kc5 Rxe3 2.dxe3 Rh5+ 3.Kd4 Rd5#

Exchanged existence of wRh3 and wRh4.

View in Helpmate Analyzer

FEN: 8/7p/7P/8/1kPp3R/2pPp2R/7K/8

External links:

Larsson, Bror

Springaren, 1953

1st Prize

Example: Larsson theme
h#3*  (3+4)

1...Sg4 2.Rhh5 Sf2 3.Rhd5 Sf3#

1.Rd5 Sh3 2.Rc1 Sf2 3.Rcc5 Sf3#

Exchanged final squares of white Ss and black Rs.

View in Helpmate Analyzer

FEN: 8/8/8/2r5/3k4/1K2p3/7N/6Nr

External links:

Moder, Janez

Partizan TT, 1958

1st HM

Example: Larsson theme
h#2*  (4+2)

1...Rb6 2.Bxg8 Rh6#

1.Bxb3 Rg6 2.Bg8 Rh6#

Exchanged existence of wRb3 and wRg8.

View in Helpmate Analyzer

FEN: 5BR1/7k/8/8/8/1RK5/b7/8

External links:

Shapiro, Misha

harmonie, 2010

1st Prize

Example: Larsson theme
h#3.5*  (5+12)

1... ... 2.a2 exd7 3.axb1=B d8=S 4.Bh7 Sxf7#

1...Sxa3 2.Bxe6 Sb5 3.Bf5 Sd6 4.Bh7 Sxf7#

Exchanged existence of wSb1 and wPe6 (promoted to S) on the f7 square, and bBd7 and bPa3 (promoted to B) on the h7 square.

View in Helpmate Analyzer

FEN: 6nk/3bppn1/2p1P2b/2p5/2P5/p1P4p/3r4/1NK5

External links: