MESON Chess Problem Database
Problem Display
PID: 62208 (N3R1r1/r7/8/1K1k1N2/2p3q1/2P1bP2/8/Q3n3 w - - 0 1)
Nathan, ND
Schachzeitung der Berliner Schachgesellschaft, 1851
#2
7 + 7
SOLUTION
- SOUND
- Sets
- 1...Qe4
- 2.fxe4#
- 1...Rxa1
- 2.Sc7#
- 1...Ra2
- 2.Sc7#
- 1...Ra3
- 2.Sc7#
- 1...Ra4
- 2.Sc7#
- 1...Ra6
- 2.Sc7#
- 1...Rc7
- 2.Sxc7#
- 1...Rxa8
- 2.Qxa8#
- 1...Bc1
- 2.Sb6#
- 1...Bd2
- 2.Sb6#
- 1...Bf4
- 2.Sb6#
- 1...Bg5
- 2.Sb6#
- 1...Bb6
- 2.Sxb6#
- 1...Bh6
- 2.Sb6#
- 1...Qe4
- Tries
- 1.Qd1+?
- 1...Qd4
- 2.Sb6#
- 1...Bd2
- 2.Sb6#
- 1...Bd4
- 2.Sb6#
- 1...Sd3!
- 1...Qd4
- 1.Qd1+?
- Keys
- 1.Qa6!
- threat
- 2.Sxe3#
- 2.Qc6#
- 2.Qd6#
- 2.Qe6#
- 1...Rb7+
- 2.Qxb7#
- 1...Qxf3
- 2.Qc6#
- 2.Qd6#
- 2.Qe6#
- 1...Qxf5
- 2.Qc6#
- 1...Rxa6
- 2.Sc7#
- 1...Rxe8
- 2.Qd6#
- 1...Re7
- 2.Qd6#
- 1...Qg1
- 2.Qc6#
- 2.Qd6#
- 2.Qe6#
- 1...Qg3
- 2.Sxe3#
- 2.Qc6#
- 2.Qe6#
- 1...Qd4
- 2.Qc6#
- 2.Qd6#
- 2.Qe6#
- 1...Qe4
- 2.Qc6#
- 2.Qd6#
- 2.fxe4#
- 1...Qf4
- 2.Qc6#
- 2.Qe6#
- 1...Qg5
- 2.Qc6#
- 2.Qd6#
- 2.Qe6#
- 1...Qg6
- 2.Sxe3#
- 1...Rc7
- 2.Sxe3#
- 2.Sxc7#
- 2.Qd6#
- 2.Qe6#
- 1...Rd7
- 2.Sxe3#
- 2.Qc6#
- 2.Qe6#
- 1...Rg6
- 2.Sxe3#
- 1...Bc1
- 2.Sb6#
- 2.Qc6#
- 2.Qd6#
- 2.Qe6#
- 1...Bg1
- 2.Qc6#
- 2.Qd6#
- 2.Qe6#
- 1...Bd2
- 2.Sb6#
- 2.Qc6#
- 2.Qd6#
- 2.Qe6#
- 1...Bf2
- 2.Qc6#
- 2.Qd6#
- 2.Qe6#
- 1...Bd4
- 2.Qc6#
- 2.Qd6#
- 2.Qe6#
- 1...Bf4
- 2.Sb6#
- 2.Qc6#
- 2.Qe6#
- 1...Bc5
- 2.Qc6#
- 2.Qe6#
- 1...Bg5
- 2.Sb6#
- 2.Qc6#
- 2.Qd6#
- 2.Qe6#
- 1...Bb6
- 2.Sxb6#
- 1...Bh6
- 2.Sb6#
- 2.Qc6#
- 2.Qd6#
- 2.Qe6#
- 1...Sc2
- 2.Qc6#
- 2.Qd6#
- 2.Qe6#
- 1...Sg2
- 2.Qc6#
- 2.Qd6#
- 2.Qe6#
- threat
- 1.Qa6!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 6
- REMOVED MATES = 12
- Sets
- Q(d);OGATE::P(C),XQ(d)
- R(f);N_GUARD,XQ(A)::S(F)
- R(f);N_GUARD::S(F)
- R(f);N_GUARD::S(F),XR(f)
- R(f);OGATE,XS(F)::QAB(A),XR(f)
- B(b);N_GUARD::S(F)
- B(b);N_GUARD::S(F),XB(b)
- Tries
- Try
- Q(A);CHECK
- Vars
- Q(d);P_SPINQ(d)::S(F)
- B(b);P_SPINB(b)::S(F)
- Refutation
- S(a);P_SPINS(a)
- Try
- Actual
- Q(A);
- Threat
- DUALS(4)
- Vars
- R(f);CHECK,N_GUARD::QAB(A),XR(f)
- Q(d);XS(E)::QAB1(A)
- R(f);N_GUARD,XQ(A)::S(F)
- R(g);XR(G)::QAR1(A)
- R(f);::QAR1(A)
- Q(d);::S(E),XB(b)
- R(g);::S(E),XB(b)
- B(b);N_GUARD::S(F),XB(b)
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).