Exchange of functions

Two pieces of the same colour exchange functions in different phases.

Kirtley, Mark

The Problemist, 1988

1st HM

Example: Exchange of functions
h#2 2.1... (6+7)

1.Bh7 Bd8 2.Rg6 Re2#
1.Rh6 Rf2 2.Bg6 Bc7#

Exchange of functions (bBe4/bRe6, Critical move / Line opening + Interfering),
Exchange of functions (wRc2/wBa5, Mate / Guard).

View in Helpmate Analyzer

FEN: 2B1r3/6n1/4r3/B1Ppk3/4b2R/7K/2R3p1/8

External links:

Feather, Christopher John

Schach-Aktiv, 1991

Example: Exchange of functions
h#2 2.1... (5+8)

1.Kd4 Bb8 2.Rc2 Rxd3#
1.Kc4 Rb8 2.Bg1 Bxd3#

Exchange of functions (bBb6/bRc7, Passive / Line opening + Interfering)
Exchange of functions (wBa7/wRc8, Guard / Passive guard)
Exchange of functions (wBf1/wRb3, Passive guard / Mate)

View in Helpmate Analyzer

FEN: 2R5/B1r5/1b6/2kn4/b3n3/1R1p4/8/3K1B1r

External links:

Feather, Christopher John

Moultings 2, 1991

Example: Exchange of functions
h#2 2.1... (7+8)

1.Kf5 Sd5 2.Rxh6 Sxh6#
1.Ke7 Sd6 2.Bxg8 Sxg8#

Exchange of functions (bBa2/bRa6, Passive / Active sacrifice)
Exchange of functions (wRh6/wBg8, Captured / Passive guard)
Exchange of functions (wSf6/wSf7, Line opening + Guard / Mate)

View in Helpmate Analyzer

FEN: 3r1nB1/3p1N2/r3kN1R/7P/4qP2/4n3/b7/4K3

External links:

Uddgren, Anders

Dunaujvaros JT, Magyar Sakkelet, 1966

1st Prize

Example: Exchange of functions
h#2 2.1... (6+9)

1.R1b6 Sxg7 2.Bb3 Sc6#
1.R8b2 Sxg6 2.Sb3 Sd4#

View in Helpmate Analyzer

FEN: 1r5q/K4pp1/R3Nkp1/4N3/7P/8/8/Brnb4

External links:

Kricheli, Josif

Schach-Echo, 1974

Example: Exchange of functions
h#2 2.1... (6+7)

1.Sb3 Be4 2.Ke3 Qc1#
1.Sd7 Re4+ 2.Kxf5 Ra5#

View in Helpmate Analyzer

FEN: 2Q5/6bK/4Rp2/2n2P2/3p1k2/R2B4/4pp2/8

External links:

Fougiaxis, Charalampos Harry

Shahmat, Israel Ring Tourney, 1985

1st Prize

Example: Exchange of functions
h#2 b) bPd6→b5  (10+11)

a) 1.Qxc5 Qxe4 2.Se2 Qxa4#
b) 1.Rxd5 Qxc3 2.Sd2 Qf6#

Exchange of functions (bQb4/bRe5, Line opening + Pinned / Interfered)
Exchange of functions (bSc3/bSe4, Line opening + Interfering / Captured)
Exchange of functions (wRc1/wBg2, Passive pin / Passive guard)
Exchange of functions (wSc5/wSd5, Captured / Passive guard)

View in Helpmate Analyzer

FEN: 8/7r/PPkp4/2NNr1p1/pq2n3/bPn5/2Q2PB1/2R1Kb2

External links:

Pachl, Franz

Schach-Report, 1992

4th Prize

Example: Exchange of functions
h#2 2.1... (9+8)

1.Bxe5 Sb4 2.Ke3 Bb6#
1.Sxd5 Sf7 2.Kf3 Qf5#

Exchange of functions (wBb7/wRe7, Passive guard / Passive pin)
Exchange of functions (wBc7/wQd7, Mate / Passive guard)
Exchange of functions (wSd5/wSe5, Captured / Interfering + Line opening)

View in Helpmate Analyzer

FEN: 5r2/1BBQR3/8/K2NN3/2Pb1nP1/2p5/4qkp1/1r6

External links:

Jones, Christopher James Austin

Problem-Forum, 2005

6th HM

Example: Exchange of functions
h#3 2.1... (5+9)

1.Rxg4 Bxd6+ 2.Kf5 Bg3 3.Bb5 Re5#
1.Bxg5 Rxe2+ 2.Kf6 Re8 3.Sb5 Be5#

Exchange of functions (bBe2/bSd6, Captured / Interfering + Line opening)
Exchange of functions (bRf4/bBe7, Passive / Self-block + Line opening)
Exchange of functions (wPg4/wPg5, Captured / Passive guard)
Exchange of functions (wRe1/wBb8, Guard / Mate)

View in Helpmate Analyzer

FEN: 1B6/4bp2/3n2p1/q3k1P1/5rP1/8/2p1b2K/4R3

External links:

Jones, Christopher James Austin

Springaren, 2012

1st Prize

Example: Exchange of functions
h#3 2.1... (5+7)

1.Kd5 f4 2.Rb6 Rc6 3.Bd4 Bxg2#
1.Kd6 d4 2.Bb7 Bc6 3.Rc7 Rxf6#

View in Helpmate Analyzer

FEN: 2r5/K3n3/2k2r1R/8/6p1/8/3P1Pb1/b6B

External links:

Garai, Toma

Probleemblad, 1993

Comm.

Example: Exchange of functions
h#3 b) wPa4→e5  (3+12)

a) 1.Sce4 Qxe2 2.Rd6 Qxf1 3.R1d4 Qb5#
b) 1.Sg4 Qxd2 2.Bb5 Qxd1 3.Qc4 Qd6#

Exchange of functions bRd1/bQf1, bRd2/bBe2, and bSc3/bSf6.

View in Helpmate Analyzer

FEN: 8/8/5n1p/p1k5/P6K/1pnQ2p1/3rb3/3rbq2

External links:

Pachl, Franz

Schach, 1982

Example: Exchange of functions
h#2 2.1... (9+8)

1.Bxf4+ Kg6 2.Bd6 Re3#
1.Rxe6+ Kg5 2.Re3 Bd6#

View in Helpmate Analyzer

FEN: 6B1/p5PP/r3R2K/p6P/P4B1R/k7/1pp5/1qb5

External links: