MESON Chess Problem Database
Problem Display
PID: 218152 (Q7/8/8/8/1p3Np1/1K1p4/3p4/R1rkr2R w - - 0 1)
Stewart, John
British Chess Magazine, 1921
#2
5 + 7
SOLUTION
- SOUND
- Sets
- 1...Rxa1
- 2.Qxa1#
- 1...Rb1+
- 2.Rxb1#
- 1...Rf1
- 2.Rxf1#
- 1...Rg1
- 2.Rxg1#
- 1...Rxh1
- 2.Qxh1#
- 1...g3
- 2.Qf3#
- 1...Rxa1
- Tries
- 1.Kb2?
- 1...Rb1+
- 2.Rxb1#
- 1...Rxa1
- 2.Qxa1#
- 1...Rxh1
- 2.Qxh1#
- 1...Rf1
- 2.Rxf1#
- 1...Rg1
- 2.Rxg1#
- 1...g3
- 2.Qf3#
- 1...b3!
- 1...Rb1+
- 1.Rb1?
- 1...Rxh1
- 2.Qxh1#
- 1...Rf1
- 2.Rxf1#
- 1...Rg1
- 2.Rxg1#
- 1...g3
- 2.Qf3#
- 1...Rxb1+!
- 1...Rxh1
- 1.Rf1?
- 1...Rb1+
- 2.Rxb1#
- 1...Rxa1
- 2.Qxa1#
- 1...g3
- 2.Qf3#
- 1...Rxf1!
- 1...Rb1+
- 1.Rg1?
- 1...Rb1+
- 2.Rxb1#
- 1...Rxa1
- 2.Qxa1#
- 1...Rf1
- 2.Rxf1#
- 1...g3
- 2.Qf3#
- 1...Rxg1!
- 1...Rb1+
- 1.Qg2?
- threat
- 2.Qxg4#
- 1...Rb1+
- 2.Rxb1#
- 1...Rxh1
- 2.Qxh1#
- 1...Rf1
- 2.Rxf1#
- 2.Qxf1#
- 1...Rg1
- 2.Rxg1#
- 2.Qxg1#
- 1...g3
- 2.Qf3#
- 1...Rxa1!
- threat
- 1.Qe4?
- 1...Rb1+
- 2.Rxb1#
- 1...Rxh1
- 2.Qxh1#
- 1...Rf1
- 2.Rxf1#
- 1...Rg1
- 2.Rxg1#
- 1...g3
- 2.Qf3#
- 1...Rxa1!
- 1...Rb1+
- 1.Qd5?
- 1...Rb1+
- 2.Rxb1#
- 1...Rxh1
- 2.Qxh1#
- 1...Rf1
- 2.Rxf1#
- 1...Rg1
- 2.Rxg1#
- 1...g3
- 2.Qf3#
- 2.Qh5#
- 1...Rxa1!
- 1...Rb1+
- 1.Qc6?
- 1...Rb1+
- 2.Rxb1#
- 1...Rxh1
- 2.Qxh1#
- 1...Rf1
- 2.Rxf1#
- 1...Rg1
- 2.Rxg1#
- 1...g3
- 2.Qf3#
- 1...Rxa1!
- 1...Rb1+
- 1.Qb7?
- 1...Rb1+
- 2.Rxb1#
- 1...Rxh1
- 2.Qxh1#
- 1...Rf1
- 2.Rxf1#
- 1...Rg1
- 2.Rxg1#
- 1...g3
- 2.Qf3#
- 1...Rxa1!
- 1...Rb1+
- 1.Qa4?
- threat
- 2.Kxb4#
- 1...Rb1+
- 2.Rxb1#
- 1...Rxa1
- 2.Qxa1#
- 1...Rf1
- 2.Rxf1#
- 1...Rg1
- 2.Rxg1#
- 1...Rxh1!
- threat
- 1.Qa5?
- 1...Rb1+
- 2.Rxb1#
- 1...Rxa1
- 2.Qxa1#
- 1...Rf1
- 2.Rxf1#
- 1...Rg1
- 2.Rxg1#
- 1...g3
- 2.Qh5#
- 1...Rxh1!
- 1...Rb1+
- 1.Kb2?
- Keys
- 1.Qh8!
- 1...Rb1+
- 2.Rxb1#
- 1...Rxa1
- 2.Qxa1#
- 1...Rxh1
- 2.Qxh1#
- 1...Rf1
- 2.Rxf1#
- 1...Rg1
- 2.Rxg1#
- 1...g3
- 2.Qh5#
- 1...Rb1+
- 1.Qh8!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 1
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- R(a);N_SPINR(a),OGATE,P_SPINR(c),XR(A)::QAR(E),XR(a)
- R(a);CHECK,OGATEB::R(A),XR(a)
- R(c);OGATEB::R(B),XR(c)
- R(c);OGATE,XR(B)::QAR(E),XR(c)
- P(g);N_GUARD::QAB(E)
- Tries
- Try
- K(C);P-FLIGHT
- Vars
- R(a);CHECK,OGATEB::R(A),XR(a)
- R(a);N_SPINR(a),OGATE,P_SPINR(c),XR(A)::QAR(E),XR(a)
- R(c);OGATE,XR(B)::QAR(E),XR(c)
- R(c);OGATEB::R(B),XR(c)
- P(g);N_GUARD::QAB(E)
- Refutation
- P(f);
- Try
- R(A);
- Vars
- R(c);OGATE,XR(B)::QAR(E),XR(c)
- R(c);OGATEB::R(B),XR(c)
- P(g);N_GUARD::QAB(E)
- Refutation
- R(a);CHECK,N_SPINR(a),P_SPINR(c),XR(A)
- Try
- R(B);
- Vars
- R(a);CHECK,OGATEB::R(A),XR(a)
- R(a);N_SPINR(a),OGATE,P_SPINR(c),XR(A)::QAR(E),XR(a)
- P(g);N_GUARD::QAB(E)
- Refutation
- R(c);XR(B)
- Try
- R(B);
- Vars
- R(a);CHECK,OGATEB::R(A),XR(a)
- R(a);N_SPINR(a),OGATE,P_SPINR(c),XR(A)::QAR(E),XR(a)
- R(c);OGATEB::R(B),XR(c)
- P(g);N_GUARD::QAB(E)
- Refutation
- R(c);XR(B)
- Try
- Q(E);
- Threat
- QAB(E),XP(g)
- Vars
- R(a);CHECK,OGATEB::R(A),XR(a)
- R(c);OGATE,XR(B)::QAR(E),XR(c)
- P(g);N_GUARD::QAB(E)
- Refutation
- R(a);N_SPINR(a),P_SPINR(c),XR(A)
- Try
- Q(E);
- Vars
- R(a);CHECK,OGATEB::R(A),XR(a)
- R(c);OGATE,XR(B)::QAR(E),XR(c)
- R(c);OGATEB::R(B),XR(c)
- P(g);N_GUARD::QAB(E)
- Refutation
- R(a);N_SPINR(a),P_SPINR(c),XR(A)
- Try
- Q(E);
- Vars
- R(a);CHECK,OGATEB::R(A),XR(a)
- R(c);OGATE,XR(B)::QAR(E),XR(c)
- R(c);OGATEB::R(B),XR(c)
- Refutation
- R(a);N_SPINR(a),P_SPINR(c),XR(A)
- Try
- Q(E);
- Vars
- R(a);CHECK,OGATEB::R(A),XR(a)
- R(c);OGATE,XR(B)::QAR(E),XR(c)
- R(c);OGATEB::R(B),XR(c)
- P(g);N_GUARD::QAB(E)
- Refutation
- R(a);N_SPINR(a),P_SPINR(c),XR(A)
- Try
- Q(E);
- Vars
- R(a);CHECK,OGATEB::R(A),XR(a)
- R(c);OGATE,XR(B)::QAR(E),XR(c)
- R(c);OGATEB::R(B),XR(c)
- P(g);N_GUARD::QAB(E)
- Refutation
- R(a);N_SPINR(a),P_SPINR(c),XR(A)
- Try
- Q(E);
- Threat
- QAB(E)+K(C),XP(f)
- Vars
- R(a);CHECK,OGATEB::R(A),XR(a)
- R(a);N_SPINR(a),OGATE,P_SPINR(c),XR(A)::QAR(E),XR(a)
- R(c);OGATEB::R(B),XR(c)
- Refutation
- R(c);XR(B)
- Try
- Q(E);
- Vars
- R(a);CHECK,OGATEB::R(A),XR(a)
- R(a);N_SPINR(a),OGATE,P_SPINR(c),XR(A)::QAR(E),XR(a)
- R(c);OGATEB::R(B),XR(c)
- P(g);OGATEB::QAB(E)
- Refutation
- R(c);XR(B)
- Try
- Actual
- Q(E);
- Vars
- R(a);CHECK,OGATEB::R(A),XR(a)
- R(a);N_SPINR(a),OGATE,P_SPINR(c),XR(A)::QAR(E),XR(a)
- R(c);OGATE,XR(B)::QAR(E),XR(c)
- R(c);OGATEB::R(B),XR(c)
- P(g);OGATEB::QAB(E)
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).