MESON Chess Problem Database
Problem Display
PID: 41408 (8/4BK2/5n2/3kr3/Q1pr4/2n5/6R1/q6B w - - 0 1)
Stubbs, Arthur Goodwin
Simple Two-move Themes, 1924
#2
5 + 7
SOLUTION
- SOUND
- Sets
- 1...Qc1
- 2.Qa8#
- 1...Qd1
- 2.Qa8#
- 1...Qe1
- 2.Qa8#
- 1...Qf1
- 2.Qa8#
- 1...Qg1
- 2.Qa8#
- 1...Qxh1
- 2.Qa8#
- 1...Rd1
- 2.Rd2#
- 1...Rd2
- 2.Rxd2#
- 1...Rde4
- 2.Rd2#
- 1...Rf4
- 2.Rd2#
- 1...Rg4
- 2.Rd2#
- 1...Rh4
- 2.Rd2#
- 1...Re1
- 2.Rg5#
- 1...Re2
- 2.Rg5#
- 1...Re3
- 2.Rg5#
- 1...Ree4
- 2.Rg5#
- 1...Rg5
- 2.Rxg5#
- 1...Rh5
- 2.Rg5#
- 1...Re6
- 2.Rg5#
- 1...Sa2
- 2.Qa8#
- 1...Qc1
- Tries
- 1.Rg1+?
- 1...Ree4
- 2.Rg5#
- 1...Sce4
- 2.Qb5#
- 1...Sfe4
- 2.Qd7#
- 1...Rde4!
- 1...Ree4
- 1.Ra2+?
- 1...Qxh1
- 2.Qa8#
- 1...Rde4
- 2.Rd2#
- 1...Sce4
- 2.Qb5#
- 2.Qa8#
- 1...Sfe4
- 2.Qd7#
- 2.Qa8#
- 1...Ree4!
- 1...Qxh1
- 1.Rb2+?
- 1...Qxh1
- 2.Qa8#
- 1...Rde4
- 2.Rd2#
- 1...Sce4
- 2.Qb5#
- 1...Sfe4
- 2.Qd7#
- 1...Ree4!
- 1...Qxh1
- 1.Rc2+?
- 1...Qxh1
- 2.Qa8#
- 1...Rde4
- 2.Rd2#
- 1...Sce4
- 2.Qb5#
- 1...Sfe4
- 2.Qd7#
- 1...Ree4!
- 1...Qxh1
- 1.Rd2+?
- 1...Qxh1
- 2.Qa8#
- 1...Sce4
- 2.Qb5#
- 1...Sfe4
- 2.Qd7#
- 1...Re4!
- 1...Qxh1
- 1.Re2+?
- 1...Qxh1
- 2.Qa8#
- 1...Rde4
- 2.Rd2#
- 1...Sce4
- 2.Qb5#
- 1...Sfe4
- 2.Qd7#
- 1...Ree4!
- 1...Qxh1
- 1.Rh2+?
- 1...Qxh1
- 2.Qa8#
- 1...Rde4
- 2.Rd2#
- 1...Sce4
- 2.Qb5#
- 1...Sfe4
- 2.Qd7#
- 1...Ree4!
- 1...Qxh1
- 1.Rg3+?
- 1...Qxh1
- 2.Qa8#
- 1...Ree4
- 2.Rg5#
- 1...Sce4
- 2.Qb5#
- 1...Sfe4
- 2.Qd7#
- 1...Rde4!
- 1...Qxh1
- 1.Rg4+?
- 1...Qxh1
- 2.Qa8#
- 1...Ree4
- 2.Rg5#
- 1...Sce4
- 2.Qb5#
- 1...Sfe4
- 2.Qd7#
- 1...Rde4!
- 1...Qxh1
- 1.Rg5+?
- 1...Qxh1
- 2.Qa8#
- 1...Sce4
- 2.Qb5#
- 1...Sfe4
- 2.Qd7#
- 1...Re4!
- 1...Qxh1
- 1.Rg6+?
- 1...Qxh1
- 2.Qa8#
- 1...Ree4
- 2.Rg5#
- 1...Sce4
- 2.Qb5#
- 1...Sfe4
- 2.Qc6#
- 2.Qd7#
- 1...Rde4!
- 1...Qxh1
- 1.Rg7+?
- 1...Qxh1
- 2.Qa8#
- 1...Ree4
- 2.Rg5#
- 1...Sce4
- 2.Qb5#
- 1...Sfe4
- 2.Qd7#
- 1...Rde4!
- 1...Qxh1
- 1.Rg8+?
- 1...Qxh1
- 2.Qa8#
- 1...Ree4
- 2.Rg5#
- 1...Sce4
- 2.Qb5#
- 1...Sfe4
- 2.Rd8#
- 2.Qd7#
- 1...Rde4!
- 1...Qxh1
- 1.Rg1+?
- Keys
- 1.Rf2+!
- 1...Qxh1
- 2.Qa8#
- 1...Rde4
- 2.Rd2#
- 1...Ree4
- 2.Rf5#
- 1...Sce4
- 2.Qb5#
- 1...Sfe4
- 2.Qd7#
- 1...Qxh1
- 1.Rf2+!
FEATURES
- Static
- TYPE = CHECKING_KEY
- CHANGED MATES = 1
- ADDED MATES = 2
- REMOVED MATES = 17
- Sets
- Q(a);N_GUARD::QAB(C)
- Q(a);N_GUARD,XB(A)::QAB(C)
- R(d);::B(A)+R(B),DCHECK
- R(d);::B(A)+R(B),DCHECK,XR(d)
- R(d);S_CUTQ(a),S_CUTR(f),S_CUTS(b),S_CUTS(g)::R(B)
- R(f);::B(A)+R(B),DCHECK
- R(f);S_CUTQ(a),S_CUTR(d),S_CUTS(b),S_CUTS(g)::R(B)
- R(f);::B(A)+R(B),DCHECK,XR(f)
- S(b);S_CUTQ(a)::QAB(C)
- Tries
- Try
- R(B);CHECK
- Vars
- R(f);P_SPINR(f),S_CUTQ(a),S_CUTR(d),S_CUTS(b),S_CUTS(g)::R(B)
- S(b);P_SPINS(b)::QAR2(C)
- S(g);P_SPINS(g)::QAR2(C)
- Refutation
- R(d);P_SPINR(d)
- Try
- R(B);CHECK
- Vars
- Q(a);XB(A)::QAB(C)
- R(d);P_SPINR(d),S_CUTQ(a),S_CUTR(f),S_CUTS(b),S_CUTS(g)::R(B)
- Refutation
- R(f);P_SPINR(f)
- Try
- R(B);CHECK
- Vars
- Q(a);XB(A)::QAB(C)
- R(d);P_SPINR(d),S_CUTQ(a),S_CUTR(f),S_CUTS(b),S_CUTS(g)::R(B)
- S(b);P_SPINS(b)::QAR2(C)
- S(g);P_SPINS(g)::QAR2(C)
- Refutation
- R(f);P_SPINR(f)
- Try
- R(B);CHECK
- Vars
- Q(a);XB(A)::QAB(C)
- R(d);P_SPINR(d),S_CUTQ(a),S_CUTR(f),S_CUTS(b),S_CUTS(g)::R(B)
- S(b);P_SPINS(b)::QAR2(C)
- S(g);P_SPINS(g)::QAR2(C)
- Refutation
- R(f);P_SPINR(f)
- Try
- R(B);CHECK,P_PINR(d)
- Vars
- Q(a);XB(A)::QAB(C)
- S(b);P_SPINS(b)::QAR2(C)
- S(g);P_SPINS(g)::QAR2(C)
- Refutation
- R(f);
- Try
- R(B);CHECK
- Vars
- Q(a);XB(A)::QAB(C)
- R(d);P_SPINR(d),S_CUTQ(a),S_CUTR(f),S_CUTS(b),S_CUTS(g)::R(B)
- S(b);P_SPINS(b)::QAR2(C)
- S(g);P_SPINS(g)::QAR2(C)
- Refutation
- R(f);P_SPINR(f)
- Try
- R(B);CHECK
- Vars
- Q(a);XB(A)::QAB(C)
- R(d);P_SPINR(d),S_CUTQ(a),S_CUTR(f),S_CUTS(b),S_CUTS(g)::R(B)
- S(b);P_SPINS(b)::QAR2(C)
- S(g);P_SPINS(g)::QAR2(C)
- Refutation
- R(f);P_SPINR(f)
- Try
- R(B);CHECK
- Vars
- Q(a);XB(A)::QAB(C)
- R(f);P_SPINR(f),S_CUTQ(a),S_CUTR(d),S_CUTS(b),S_CUTS(g)::R(B)
- S(b);P_SPINS(b)::QAR2(C)
- S(g);P_SPINS(g)::QAR2(C)
- Refutation
- R(d);P_SPINR(d)
- Try
- R(B);CHECK
- Vars
- Q(a);XB(A)::QAB(C)
- R(f);P_SPINR(f),S_CUTQ(a),S_CUTR(d),S_CUTS(b),S_CUTS(g)::R(B)
- S(b);P_SPINS(b)::QAR2(C)
- S(g);P_SPINS(g)::QAR2(C)
- Refutation
- R(d);P_SPINR(d)
- Try
- R(B);CHECK,P_PINR(f)
- Vars
- Q(a);XB(A)::QAB(C)
- S(b);P_SPINS(b)::QAR2(C)
- S(g);P_SPINS(g)::QAR2(C)
- Refutation
- R(d);N_SPINR(f),P_SPINR(d)
- Try
- R(B);CHECK
- Vars
- Q(a);XB(A)::QAB(C)
- R(f);P_SPINR(f),S_CUTQ(a),S_CUTR(d),S_CUTS(b),S_CUTS(g)::R(B)
- S(b);P_SPINS(b)::QAR2(C)
- Refutation
- R(d);P_SPINR(d)
- Try
- R(B);CHECK
- Vars
- Q(a);XB(A)::QAB(C)
- R(f);P_SPINR(f),S_CUTQ(a),S_CUTR(d),S_CUTS(b),S_CUTS(g)::R(B)
- S(b);P_SPINS(b)::QAR2(C)
- S(g);P_SPINS(g)::QAR2(C)
- Refutation
- R(d);P_SPINR(d)
- Try
- R(B);CHECK
- Vars
- Q(a);XB(A)::QAB(C)
- R(f);P_SPINR(f),S_CUTQ(a),S_CUTR(d),S_CUTS(b),S_CUTS(g)::R(B)
- S(b);P_SPINS(b)::QAR2(C)
- Refutation
- R(d);P_SPINR(d)
- Try
- Actual
- R(B);CHECK
- Vars
- Q(a);XB(A)::QAB(C)
- R(d);P_SPINR(d),S_CUTQ(a),S_CUTR(f),S_CUTS(b),S_CUTS(g)::R(B)
- R(f);P_SPINR(f),S_CUTQ(a),S_CUTR(d),S_CUTS(b),S_CUTS(g)::R(B)
- S(b);P_SPINS(b)::QAR2(C)
- S(g);P_SPINS(g)::QAR2(C)
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).