Bi-valve

A move that simultaneously opens the line of one and closes the line of another piece.

See also: Valve; Paros theme.

Alias: Bivalve.

Kirtley, Mark

The Problemist, 1988

1st HM

Example: Bi-valve
h#2 2.1... (6+7)

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

Bi-valve (bB-wR-bR), Bi-valve (bR-wB-bB).

View in Helpmate Analyzer

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

External links:

Feather, Christopher John

Schach-Aktiv, 1991

Example: Bi-valve
h#2 2.1... (5+8)

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

Bi-valve (bB-wB-bR), Bi-valve (bR-wB-bB).

View in Helpmate Analyzer

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

External links:

Blaustein, Yeshayahu

Israel Ring Tourney, 1967

2nd HM

Example: Bi-valve
h#2 2.1... (6+6)

1.Qa6 Qf6 2.Bb5 c4#
1.Qa3 Qg5 2.Rb3 c3#

Bi-valve (wP-wB-bB).

View in Helpmate Analyzer

FEN: 3QK3/3P4/8/8/4k3/3qrp2/1pP1b3/1B2R3

External links:

Feather, Christopher John

Moultings 7 , 1991

Example: Bi-valve
h#2 2.1... (4+11)

1.Sfg5 Qxe4+ 2.R7d5 Qe8#
1.Seg5 Qxf3+ 2.Qd5 Qc3#

Bi-valve bS-wB-bQ, Bi-valve bS-wB-bR.

View in Helpmate Analyzer

FEN: 8/1pbr4/1pk5/1p3Q1K/1Bq1n3/5n2/8/1b1r3B

External links:

Pachl, Franz

Schach, 1982

Example: Bi-valve
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:

Alaikov, Venelin

diagrammes, 2001

2nd Prize

Example: Bi-valve
h#2 2.1... (6+9)

1.Sd4+ Ka4 2.Bd8 Se8#
1.Sc7 Kc2 2.Bf2 Sf5#

View in Helpmate Analyzer

FEN: 2r5/1p4k1/R2Nn3/4p3/4r2b/BK6/B7/3n1q1R

External links:

Kricheli, Josif

Schach-Echo, 1974

Example: Bi-valve
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:

Visserman, Eeltje

Sahs/Shakhmaty (Riga), 1965

2nd Prize

Example: Bi-valve
h#2 2.1... (7+8)

1.Bxb2+ Kf7 2.Bf6 Sd5#
1.Rxf4+ Kg7 2.Rf6 Sd1#

View in Helpmate Analyzer

FEN: 4r3/2p4p/5K1p/8/P4N1R/4k3/RN2Prp1/b7

External links: