MESON Chess Problem Database
Problem Display
PID: 185257 (4K3/6B1/8/4N2B/8/3P4/RR1p1p1n/2k1NQ2 w - - 0 1)
Ling, John Francis
Chess, 1956
#2
9 + 4
SOLUTION
- SOUND
- Sets
- 1...dxe1Q
- 2.Bh6#
- 1...dxe1S
- 2.Bh6#
- 1...dxe1B
- 2.Bh6#
- 1...dxe1R
- 2.Bh6#
- 1...d1B
- 2.Bh6#
- 1...dxe1Q
- Tries
- 1.Sc2+?
- 1...d1Q
- 2.Bh6#
- 2.Qxd1#
- 1...d1S
- 2.Bh6#
- 2.Qxd1#
- 1...d1B
- 2.Bh6#
- 2.Qxd1#
- 1...d1R
- 2.Bh6#
- 2.Qxd1#
- 1...Sxf1!
- 1...d1Q
- 1.Sg2+?
- 1...d1Q
- 2.Bh6#
- 2.Qxd1#
- 1...d1S
- 2.Bh6#
- 2.Qxd1#
- 1...d1B
- 2.Bh6#
- 2.Qxd1#
- 1...d1R
- 2.Bh6#
- 2.Qxd1#
- 1...Sxf1!
- 1...d1Q
- 1.S1f3+?
- 1...d1Q
- 2.Bh6#
- 1...d1S
- 2.Bh6#
- 1...d1B
- 2.Bh6#
- 1...d1R
- 2.Bh6#
- 1...Sxf1!
- 1...d1Q
- 1.Bh6?
- threat
- 2.Bxd2#
- 1...Sf3
- 2.S1xf3#
- 1...Sg4
- 2.Sc2#
- 2.Sg2#
- 2.S1f3#
- 1...Sxf1!
- threat
- 1.Rxd2?
- threat
- 2.Rd1#
- 1...fxe1Q
- 2.Qxe1#
- 1...fxe1R
- 2.Qxe1#
- 1...Sf3
- 2.S1xf3#
- 1...Sg4
- 2.Sg2#
- 2.S1f3#
- 1...Kb1!
- threat
- 1.Qxf2?
- threat
- 2.Qc5#
- 2.Qxd2#
- 1...dxe1Q
- 2.Ra1#
- 2.Qxe1#
- 2.Qc2#
- 1...dxe1S
- 2.Bh6#
- 2.Ra1#
- 2.Qxe1#
- 2.Qe3#
- 2.Qd2#
- 2.Qf4#
- 1...dxe1B
- 2.Ra1#
- 2.Qxe1#
- 2.Qc2#
- 1...dxe1R
- 2.Ra1#
- 2.Qxe1#
- 2.Qc5#
- 2.Qc2#
- 2.Qd2#
- 1...Sg4
- 2.Qxd2#
- 1...d1Q
- 2.Ra1#
- 1...d1S
- 2.Ra1#
- 2.Qc2#
- 2.Qd2#
- 1...d1B
- 2.Bh6#
- 2.Ra1#
- 2.Qe3#
- 2.Qd2#
- 2.Qf4#
- 1...d1R
- 2.Ra1#
- 2.Qc5#
- 2.Qc2#
- 1...Sf1
- 2.Qc5#
- 1...Sf3!
- threat
- 1.Sc2+?
- Keys
- 1.d4!
- threat
- 2.S1d3#
- 2.S5d3#
- 2.Qc4#
- 1...Sxf1
- 2.S1d3#
- 2.S5d3#
- 1...dxe1Q
- 2.Bh6#
- 1...dxe1S
- 2.Sd3#
- 2.Bh6#
- 1...dxe1B
- 2.Sd3#
- 2.Bh6#
- 1...dxe1R
- 2.Bh6#
- 2.Qc4#
- 1...fxe1Q
- 2.Qc4#
- 1...fxe1S
- 2.Sd3#
- 1...fxe1B
- 2.Sd3#
- 2.Qc4#
- 1...fxe1R
- 2.Qc4#
- 1...Sf3
- 2.S1d3#
- 1...Sg4
- 2.S1d3#
- 1...d1Q
- 2.S1d3#
- 1...d1S
- 2.S1d3#
- 2.S5d3#
- 1...d1B
- 2.S1d3#
- 2.S5d3#
- 2.Bh6#
- 1...d1R
- 2.S1d3#
- 2.Qc4#
- threat
- 1.d4!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 6
- REMOVED MATES = 4
- Sets
- P(b);OGATEB,P_PINS(F),P_SPINQ(b),XS(A)::B(H)
- P(b);OGATEB,P_SPINS(b),XS(A)::B(H)
- P(b);OGATEB,P_SPINB(b),XS(A)::B(H)
- P(b);OGATEB,P_PINS(F),P_SPINR(b),XS(A)::B(H)
- P(b);OGATEB::B(H)
- Tries
- Try
- S(A);CHECK
- Refutation
- S(d);XQ(B)
- Try
- S(A);CHECK
- Refutation
- S(d);XQ(B)
- Try
- S(A);CHECK
- Vars
- P(b);P_SPINQ(b),S_CUTS(d)::B(H)
- P(b);P_SPINS(b),S_CUTS(d)::B(H)
- P(b);P_SPINB(b),S_CUTS(d)::B(H)
- P(b);P_SPINR(b),S_CUTS(d)::B(H)
- Refutation
- S(d);XQ(B)
- Try
- B(H);P_PINP(b)
- Threat
- B(H),XP(b)
- Vars
- S(d);N_GUARD::QAR(B)+S(A),XS(d)
- Refutation
- S(d);XQ(B)
- Try
- R(D);XP(b)
- Threat
- R1(D)
- Vars
- P(c);OGATE,P_PINS(F),P_SPINQ(c),XS(A)::QAR2(B),XQ(c)
- P(c);OGATE,P_PINS(F),P_SPINR(c),XS(A)::QAR2(B),XR(c)
- S(d);N_GUARD::QAR(B)+S(A),XS(d)
- Refutation
- K(a);P-FLIGHT
- Try
- Q(B);XP(c)
- Threat
- DUALS(2)
- Vars
- S(d);::QAB1(B),XP(b)
- P(b);::R(C)
- S(d);::QAR(B)
- Refutation
- S(d);
- Try
- Actual
- P(E);
- Threat
- DUALS(3)
- Vars
- P(b);OGATEB,P_PINS(F),P_SPINQ(b),XS(A)::B(H)
- P(c);P_PINS(F),P_SPINQ(c),XS(A)::QAR(B)
- P(c);P_SPINS(c),XS(A)::S(F)
- P(c);P_PINS(F),P_SPINR(c),XS(A)::QAR(B)
- S(d);::QAR(B)+S(A),DCHECK
- P(b);::S(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).