MESON Chess Problem Database
Problem Display
PID: 70626 (1b6/4Q3/N2nr1q1/1p4p1/1Pk1BRN1/K2b4/1BpPr3/3R4 w - - 0 1)
Allison, Christopher John
Chess, 1951
#2
10 + 10
SOLUTION
- SOUND
- Sets
- 1...Qxe4
- 2.Qxe6#
- 1...Qh5
- 2.Qxe6#
- 1...Qh7
- 2.Qxe6#
- 1...Qg7
- 2.Qxe6#
- 1...Rxd2
- 2.Se3#
- 1...Rf2
- 2.Se3#
- 1...Rg2
- 2.Se3#
- 1...Rh2
- 2.Se3#
- 1...Re3
- 2.Sxe3#
- 1...R2xe4
- 2.Se3#
- 1...Re5
- 2.Sxe5#
- 1...Rf6
- 2.Se5#
- 1...Bc7
- 2.Qxc7#
- 1...Sxe4
- 2.Qc5#
- 1...Sf5
- 2.Qc5#
- 1...Sf7
- 2.Qc5#
- 1...Sc8
- 2.Qc5#
- 1...Se8
- 2.Qc5#
- 1...Qxe4
- Tries
- 1.Bxd3+?
- 1...Kxd3
- 2.Sc5#
- 2.Rd4#
- 1...Kd5!
- 1...Kxd3
- 1.Bc6+?
- 1...Qe4
- 2.Qxe6#
- 1...R2e4
- 2.Se3#
- 1...R6e4
- 2.Se5#
- 1...Be4
- 2.d3#
- 1...Se4
- 2.Qc5#
- 1...gxf4!
- 1...Qe4
- 1.Bb7+?
- 1...Qe4
- 2.Qxe6#
- 1...R2e4
- 2.Se3#
- 1...R6e4
- 2.Se5#
- 1...Be4
- 2.d3#
- 1...Se4
- 2.Qc5#
- 1...gxf4!
- 1...Qe4
- 1.Ba8+?
- 1...Qe4
- 2.Qxe6#
- 1...R2e4
- 2.Se3#
- 1...R6e4
- 2.Se5#
- 1...Be4
- 2.d3#
- 1...Se4
- 2.Qc5#
- 1...gxf4!
- 1...Qe4
- 1.Qxd6?
- threat
- 2.Bxd3#
- 2.Bd5#
- 2.Qc5#
- 2.Qxd3#
- 2.Qd4#
- 2.Qd5#
- 1...Qxe4
- 2.Qc5#
- 2.Qxe6#
- 1...Rxd2
- 2.Se3#
- 2.Bxd3#
- 2.Bd5#
- 2.Qc5#
- 2.Qd4#
- 2.Qd5#
- 1...R2xe4
- 2.Se3#
- 2.Qc5#
- 1...R6xe4
- 2.Se5#
- 2.Qc5#
- 1...Rxd6
- 2.Se5#
- 1...Bxe4
- 2.Qd4#
- 2.d3#
- 1...gxf4
- 2.Bd5#
- 2.Qc5#
- 2.Qxd3#
- 2.Qd4#
- 2.Qd5#
- 1...c1S
- 2.Bxd3#
- 2.Bd5#
- 2.Qc5#
- 2.Qd4#
- 2.Qd5#
- 1...Qf5
- 2.Bxd3#
- 2.Bd5#
- 2.Qxd3#
- 2.Qd4#
- 1...Qf6
- 2.Bxd3#
- 2.Bd5#
- 2.Qc5#
- 2.Qxd3#
- 2.Qd5#
- 1...Qg7
- 2.Bxd3#
- 2.Bd5#
- 2.Qc5#
- 2.Qxd3#
- 2.Qd5#
- 2.Qxe6#
- 1...Re3
- 2.Sxe3#
- 2.Bxd3#
- 2.Bd5#
- 2.Qc5#
- 2.Qd4#
- 2.Qd5#
- 1...Re5
- 2.Sxe5#
- 2.Bxd3#
- 2.Bd5#
- 2.Qxd3#
- 2.Qd4#
- 1...Ba7
- 2.Bxd3#
- 2.Bd5#
- 2.Qxd3#
- 2.Qd5#
- 1...Bxd6!
- threat
- 1.Qa7?
- threat
- 2.Qd4#
- 2.Qc5#
- 1...Qxe4
- 2.Qc5#
- 1...R2xe4
- 2.Se3#
- 2.Qc5#
- 1...R6xe4
- 2.Qc5#
- 1...Bxe4
- 2.Qd4#
- 1...Qf5
- 2.Qd4#
- 1...Qf6
- 2.Qc5#
- 1...Qg7
- 2.Qc5#
- 1...Re5
- 2.Sxe5#
- 2.Qd4#
- 1...Sf5
- 2.Qc5#
- 1...Sb7
- 2.Qd4#
- 1...Bxa7!
- threat
- 1.Bxd3+?
- Keys
- 1.Sc7!
- threat
- 2.Bd5#
- 1...Qxe4
- 2.Qxe6#
- 1...R2xe4
- 2.Se3#
- 1...R6xe4
- 2.Se5#
- 1...Bxe4
- 2.d3#
- 1...Bxc7
- 2.Qxc7#
- 1...Sxe4
- 2.Qc5#
- threat
- 1.Sc7!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 2
- REMOVED MATES = 14
- Sets
- Q(i);N_GUARD,P_SPINQ(i),XB(F)::QAB(J),XR(h)
- Q(i);N_GUARD::QAB(J),XR(h)
- R(b);N_GUARD,XP(C)::S(H)
- R(b);N_GUARD::S(H)
- R(b);N_GUARD::S(H),XR(b)
- R(b);N_GUARD,P_SPINR(b),XB(F)::S(H)
- R(h);N_GUARD::S(H),XR(h)
- R(h);N_GUARD::S(H)
- B(j);N_GUARD::QAR(J),XB(j)
- S(g);OGATE,P_SPINS(g),XB(F)::QAR1(J)
- S(g);OGATE::QAR1(J)
- Tries
- Try
- B(F);CHECK,XB(c)
- Refutation
- K(d);S_FLIGHT
- Try
- B(F);CHECK
- Vars
- Q(i);P_SPINQ(i)::QAB(J),XR(h)
- R(b);P_SPINR(b)::S(H)
- R(h);P_SPINR(h)::S(H)
- B(c);OGATE,P_SPINB(c)::P(C)
- S(g);OGATE,P_SPINS(g)::QAR1(J)
- Refutation
- P(f);XR(G)
- Try
- B(F);CHECK
- Vars
- Q(i);P_SPINQ(i)::QAB(J),XR(h)
- R(b);P_SPINR(b)::S(H)
- R(h);P_SPINR(h)::S(H)
- B(c);OGATE,P_SPINB(c)::P(C)
- S(g);OGATE,P_SPINS(g)::QAR1(J)
- Refutation
- P(f);XR(G)
- Try
- B(F);CHECK
- Vars
- Q(i);P_SPINQ(i)::QAB(J),XR(h)
- R(b);P_SPINR(b)::S(H)
- R(h);P_SPINR(h)::S(H)
- B(c);OGATE,P_SPINB(c)::P(C)
- S(g);OGATE,P_SPINS(g)::QAR1(J)
- Refutation
- P(f);XR(G)
- Try
- Q(J);XS(g)
- Threat
- DUALS(6)
- Vars
- R(h);N_GUARD,XQ(J)::S(H)
- Refutation
- B(j);P_PINP(E),XQ(J)
- Try
- Q(J);
- Threat
- DUALS(2)
- Vars
- Q(i);P_SPINQ(i),XB(F)::QAR1(J)
- R(h);P_SPINR(h),XB(F)::QAR1(J)
- B(c);P_SPINB(c),XB(F)::QAR1(J)
- Q(i);::QAR1(J)
- S(g);::QAR1(J)
- Refutation
- B(j);XQ(J)
- Try
- Actual
- S(I);
- Threat
- R(G)+B(F),DCHECK
- Vars
- Q(i);N_GUARD,P_SPINQ(i),XB(F)::QAB(J),XR(h)
- R(b);N_GUARD,P_SPINR(b),XB(F)::S(H)
- R(h);N_GUARD,P_SPINR(h),XB(F)::S(H)
- B(c);OGATE,P_SPINB(c),XB(F)::P(C)
- B(j);OGATE,XS(I)::QAR(J),XB(j)
- S(g);OGATE,P_SPINS(g),XB(F)::QAR1(J)
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).