MESON Chess Problem Database
Problem Display
PID: 145901 (1Q2bk2/8/4P1R1/2b1p1B1/pP2P3/K7/8/8 w - - 0 1)
Penrose, Lionel Sharples
Good Companions (December Meredith Ty.), 1917
#2
7 + 5
SOLUTION
- SOUND
- Sets
- 1...Bg1
- 2.Qd6#
- 1...Bf2
- 2.Qd6#
- 1...Be3
- 2.Qd6#
- 1...Bxb4+
- 2.Qxb4#
- 1...Bd4
- 2.Qd6#
- 1...Bb6
- 2.Qd6#
- 1...Bd6
- 2.Qxd6#
- 1...Ba7
- 2.Qd6#
- 1...Be7
- 2.Bh6#
- 1...Bg1
- Tries
- 1.Ka2?
- 1...Bxb4
- 2.Qxb4#
- 1...Bg1
- 2.Qd6#
- 1...Bf2
- 2.Qd6#
- 1...Be3
- 2.Qd6#
- 1...Bd4
- 2.Qd6#
- 1...Bb6
- 2.Qd6#
- 1...Bd6
- 2.Qxd6#
- 1...Ba7
- 2.Qd6#
- 1...Be7
- 2.Bh6#
- 1...a3!
- 1...Bxb4
- 1.Bc1?
- 1...Bxb4+
- 2.Qxb4#
- 1...Bg1
- 2.Qd6#
- 1...Bf2
- 2.Qd6#
- 1...Be3
- 2.Qd6#
- 1...Bd4
- 2.Qd6#
- 1...Bb6
- 2.Qd6#
- 1...Bd6
- 2.Qxd6#
- 1...Ba7
- 2.Qd6#
- 1...Be7
- 2.Bh6#
- 1...Ke7!
- 1...Bxb4+
- 1.Bd2?
- 1...Bxb4+
- 2.Bxb4#
- 2.Qxb4#
- 1...Bg1
- 2.Qd6#
- 1...Bf2
- 2.Qd6#
- 1...Be3
- 2.Qd6#
- 1...Bd4
- 2.Qd6#
- 1...Bb6
- 2.Qd6#
- 1...Bd6
- 2.Qxd6#
- 1...Ba7
- 2.Qd6#
- 1...Be7
- 2.Bh6#
- 1...Ke7!
- 1...Bxb4+
- 1.Bh4?
- 1...Bxb4+
- 2.Qxb4#
- 1...Bg1
- 2.Qd6#
- 1...Bf2
- 2.Qd6#
- 1...Be3
- 2.Qd6#
- 1...Bd4
- 2.Qd6#
- 1...Bb6
- 2.Qd6#
- 1...Bd6
- 2.Qxd6#
- 1...Ba7
- 2.Qd6#
- 1...Be7!
- 1...Bxb4+
- 1.Bf6?
- 1...Bxb4+
- 2.Qxb4#
- 1...Bg1
- 2.Qd6#
- 1...Bf2
- 2.Qd6#
- 1...Be3
- 2.Qd6#
- 1...Bd4
- 2.Qd6#
- 1...Bb6
- 2.Qd6#
- 1...Bd6
- 2.Qxd6#
- 1...Ba7
- 2.Qd6#
- 1...Be7!
- 1...Bxb4+
- 1.Qd8?
- threat
- 2.Bh6#
- 1...Be3
- 2.Be7#
- 2.Qe7#
- 2.Qd6#
- 1...Bxb4+!
- threat
- 1.Ka2?
- Keys
- 1.Be3!
- threat
- 2.Bxc5#
- 1...Bxb4+
- 2.Qxb4#
- 1...Ke7
- 2.Bxc5#
- 1...Bxe3
- 2.Qd6#
- 1...Bd4
- 2.Qd6#
- 1...Bb6
- 2.Qd6#
- 1...Bd6
- 2.Qxd6#
- 1...Ba7
- 2.Qd6#
- 1...Be7
- 2.Bh6#
- threat
- 1.Be3!
FEATURES
- Static
- TYPE = BLOCK_THREAT
- CHANGED MATES = 0
- ADDED MATES = 1
- REMOVED MATES = 2
- Sets
- B(b);N_GUARD,N_PINP(B)::QAB(G)
- B(b);CHECK,OGATE,XP(B)::QAB(G),XB(b)
- B(b);N_GUARD::QAB(G),XB(b)
- B(b);SBLOCK::B(D)
- Tries
- Try
- K(A);N_SPINP(B),P-FLIGHT
- Vars
- B(b);OGATE,XP(B)::QAB(G),XB(b)
- B(b);N_GUARD::QAB(G)
- B(b);N_GUARD::QAB(G),XB(b)
- B(b);SBLOCK::B(D)
- Refutation
- P(a);
- Try
- B(D);
- Vars
- B(b);CHECK,OGATE,XP(B)::QAB(G),XB(b)
- B(b);N_GUARD,N_PINP(B)::QAB(G)
- B(b);N_GUARD::QAB(G),XB(b)
- B(b);SBLOCK::B(D)
- Refutation
- K(e);N_SPINB(d),S_FLIGHT
- Try
- B(D);
- Vars
- B(b);N_GUARD,N_PINP(B)::QAB(G)
- B(b);N_GUARD::QAB(G),XB(b)
- B(b);SBLOCK::B(D)
- Refutation
- K(e);N_SPINB(d),S_FLIGHT
- Try
- B(D);
- Vars
- B(b);CHECK,OGATE,XP(B)::QAB(G),XB(b)
- B(b);N_GUARD,N_PINP(B)::QAB(G)
- B(b);N_GUARD::QAB(G),XB(b)
- Refutation
- B(b);
- Try
- B(D);
- Vars
- B(b);CHECK,OGATE,XP(B)::QAB(G),XB(b)
- B(b);N_GUARD,N_PINP(B)::QAB(G)
- B(b);N_GUARD::QAB(G),XB(b)
- Refutation
- B(b);
- Try
- Q(G);
- Threat
- B(D)
- Refutation
- B(b);CHECK,XP(B)
- Try
- Actual
- B(D);
- Threat
- B(D),XB(b)
- Vars
- B(b);CHECK,OGATE,XP(B)::QAB(G),XB(b)
- K(e);N_SPINB(d),S_FLIGHT::B(D),XB(b)
- B(b);N_GUARD,N_PINP(B),XB(D)::QAB(G)
- B(b);N_GUARD,N_PINP(B)::QAB(G)
- B(b);N_GUARD::QAB(G),XB(b)
- B(b);SBLOCK::B(D)
Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) &
CSS/Javascript (jQuery, Bootstrap & DataTables).