MESON Chess Problem Database
Problem Display
PID: 44450 (3b3K/p4pP1/Rn1qk3/3pBN1n/B5P1/7N/4R3/6Q1 w - - 0 1)
Courtenay, Edward H
Dubuque Chess Journal, 1870
#2
10 + 8
| 5923 | The Chess Player's Chronicle (Sampson) | 1873 |
| 3530 | Het Half Pin Thema (II) | 1947 |
SOLUTION
- SOUND
- Sets
- 1...Qa3
- 2.Bc3#
- 1...Qb4
- 2.Bd4#
- 1...Qc5
- 2.Bd4#
- 1...Qe7
- 2.Sd4#
- 2.Ba1#
- 2.Bb2#
- 2.Bc3#
- 2.Bd4#
- 1...Qf8+
- 2.gxf8S#
- 1...Qd7
- 2.Ba1#
- 2.Bb2#
- 2.Bc3#
- 2.Bd4#
- 1...Bg5
- 2.Sxg5#
- 1...Bc7
- 2.Sg5#
- 1...Be7
- 2.Sd4#
- 1...Sg3
- 2.Sf4#
- 1...Sf4
- 2.Sxf4#
- 1...Sf6
- 2.Sf4#
- 2.Sg5#
- 1...Sxg7
- 2.Sf4#
- 1...Sxa4
- 2.Rxd6#
- 1...Sd7
- 2.Rxd6#
- 1...Sa8
- 2.Ba1#
- 2.Bb2#
- 2.Bc3#
- 2.Bd4#
- 2.Rxd6#
- 1...Sc8
- 2.Ba1#
- 2.Bb2#
- 2.Bc3#
- 2.Bd4#
- 1...f6
- 2.g8Q#
- 2.g8B#
- 1...Qa3
- Tries
- 1.Bd7+?
- 1...Qxd7
- 2.Ba1#
- 2.Bb2#
- 2.Bc3#
- 2.Bd4#
- 1...Sxd7
- 2.Rxd6#
- 1...Kxd7!
- 1...Qxd7
- 1.Qxb6?
- threat
- 2.Ba1#
- 2.Bb2#
- 2.Bc3#
- 2.Bd4#
- 2.Qxd6#
- 1...Qxb6
- 2.Ba1#
- 2.Bb2#
- 2.Bc3#
- 2.Bd4#
- 1...Bxb6
- 2.Sg5#
- 1...Qc6
- 2.Qxc6#
- 1...d4
- 2.Qb3#
- 2.Qxd6#
- 1...f6
- 2.g8Q#
- 2.g8B#
- 1...Bg5
- 2.Sxg5#
- 2.Qxd6#
- 1...Bf6
- 2.Qxd6#
- 1...Bc7
- 2.Sg5#
- 2.Ba1#
- 2.Bb2#
- 2.Bc3#
- 2.Bd4#
- 1...Be7
- 2.Sd4#
- 2.Ba1#
- 2.Bb2#
- 2.Bc3#
- 2.Bd4#
- 1...Sg3
- 2.Sf4#
- 2.Qxd6#
- 1...Sf4
- 2.Sxf4#
- 2.Qxd6#
- 1...Sf6
- 2.Sf4#
- 2.Sg5#
- 2.Qxd6#
- 1...axb6!
- threat
- 1.Bd7+?
- Keys
- 1.Qc5!
- threat
- 2.Qxd6#
- 1...Qf8+
- 2.gxf8S#
- 1...Qxc5
- 2.Bd4#
- 1...Qxe5
- 2.Qd6#
- 2.Qc6#
- 1...Qc6
- 2.Qxc6#
- 1...f6
- 2.g8Q#
- 2.g8B#
- 1...Qc7
- 2.Sd4#
- 1...Qe7
- 2.Sd4#
- 2.Ba1#
- 2.Bb2#
- 2.Bc3#
- 2.Bd4#
- 1...Qb8
- 2.Sd4#
- 1...Qd7
- 2.Sd4#
- 2.Ba1#
- 2.Bb2#
- 2.Bc3#
- 2.Bd4#
- 1...Bc7
- 2.Sg5#
- 1...Be7
- 2.Sd4#
- 1...Sc4
- 2.Qc8#
- 1...Sc8
- 2.Ba1#
- 2.Bb2#
- 2.Bc3#
- 2.Bd4#
- 2.Qxc8#
- threat
- 1.Qc5!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 4
- REMOVED MATES = 8
- Sets
- Q(d);N_GUARD,P_SPINS(c)::R(B)+B(F)
- Q(d);CHECK,OGATE,P_SPINS(c)::PXQ(d)=S
- B(h);N_GUARD::S(C),XB(h)
- B(h);N_GUARD::S(C)
- B(h);SBLOCK::S(G)
- S(b);N_GUARD::S(C)
- S(b);N_GUARD::S(C),XS(b)
- S(b);N_GUARD,XP(I)::S(C)
- S(c);OGATE,P_SPINQ(d),XB(D)::R1(H),XQ(d)
- S(c);OGATE,P_SPINQ(d)::R1(H),XQ(d)
- P(g);::P=Q
- Tries
- Try
- B(D);CHECK
- Vars
- S(c);OGATE,P_SPINQ(d),XB(D)::R1(H),XQ(d)
- Refutation
- K(e);S_FLIGHT,XB(D)
- Try
- Q(A);P_PINQ(d),XS(c)
- Threat
- DUALS(5)
- Vars
- B(h);N_GUARD,N_SPINQ(d),XQ(A)::S(C)
- Q(d);OGATEB::QAR2(A),XQ(d)
- P(g);::P=Q
- B(h);P_PINP(I)::QAR1(A),XQ(d)
- Refutation
- P(f);N_SPINQ(d),XQ(A)
- Try
- Actual
- Q(A);
- Threat
- QAR1(A),XQ(d)
- Vars
- Q(d);CHECK,OGATE,P_SPINS(c)::PXQ(d)=S
- Q(d);N_GUARD,P_SPINS(c),XQ(A)::R(B)+B(F)
- Q(d);OGATEB::QAR2(A),XQ(d)
- P(g);::P=Q
- Q(d);P_SPINS(c)::S(G)
- B(h);N_GUARD::S(C)
- B(h);SBLOCK::S(G)
- S(c);N_GUARD,P_SPINQ(d)::QAB(A)
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).