MESON Chess Problem Database
Problem Display
PID: 100937 (8/2p5/2B2R1n/5bp1/1pN2k2/1Pp1N1p1/2nQ4/B5K1 w - - 0 1)
Feenstra Kuiper, Pieter
Good Companions, 1921
#2
8 + 9
| 6490 | yacpdb | 2009 |
SOLUTION
- SOUND
- Sets
- 1...Sxa1
- 2.Qd4#
- 1...Se1
- 2.Qd4#
- 1...Sa3
- 2.Qd4#
- 1...Sxe3
- 2.Qd4#
- 1...Sd4
- 2.Qxd4#
- 1...Sg4
- 2.Sg2#
- 2.Rxf5#
- 1...Sf7
- 2.Rxf5#
- 1...Sg8
- 2.Rxf5#
- 1...cxd2
- 2.Be5#
- 1...g2
- 2.Qf2#
- 1...g4
- 2.Sg2#
- 1...Sxa1
- Tries
- 1.Kh1?
- 1...Sxa1
- 2.Qd4#
- 1...Sxe3
- 2.Qd4#
- 1...cxd2
- 2.Be5#
- 1...g4
- 2.Sg2#
- 1...Se1
- 2.Qd4#
- 1...Sa3
- 2.Qd4#
- 1...Sd4
- 2.Qxd4#
- 1...Sg4
- 2.Sg2#
- 2.Rxf5#
- 1...Sf7
- 2.Rxf5#
- 1...Sg8
- 2.Rxf5#
- 1...g2+!
- 1...Sxa1
- 1.Sxf5+?
- 1...Se3
- 2.Sxh6#
- 2.Qd4#
- 1...cxd2
- 2.Sxh6#
- 1...Kg4!
- 1...Se3
- 1.Bb2?
- 1...Sxe3
- 2.Qd4#
- 1...cxd2
- 2.Be5#
- 1...g2
- 2.Qf2#
- 1...g4
- 2.Sg2#
- 1...Sa1
- 2.Qd4#
- 1...Se1
- 2.Qd4#
- 1...Sa3
- 2.Qd4#
- 1...Sd4
- 2.Qxd4#
- 1...Sg4
- 2.Sg2#
- 2.Rxf5#
- 1...Sf7
- 2.Rxf5#
- 1...Sg8
- 2.Rxf5#
- 1...cxb2!
- 1...Sxe3
- 1.Bxc3?
- threat
- 2.Be5#
- 1...Sxe3
- 2.Qd4#
- 1...g4
- 2.Sxc2#
- 2.Sg2#
- 1...Sd4
- 2.Qxd4#
- 1...Sg4
- 2.Sg2#
- 2.Rxf5#
- 1...Sf7
- 2.Rxf5#
- 1...bxc3!
- threat
- 1.Bh1?
- 1...Sxa1
- 2.Qd4#
- 1...Sxe3
- 2.Qd4#
- 1...cxd2
- 2.Be5#
- 1...g4
- 2.Sd5#
- 1...Se1
- 2.Qd4#
- 1...Sa3
- 2.Qd4#
- 1...Sd4
- 2.Qxd4#
- 1...Sg4
- 2.Sd5#
- 2.Rxf5#
- 1...Sf7
- 2.Rxf5#
- 1...Sg8
- 2.Rxf5#
- 1...c5
- 2.Qd6#
- 1...c6
- 2.Qd6#
- 1...g2!
- 1...Sxa1
- 1.Bb7?
- 1...Sxa1
- 2.Qd4#
- 1...Sxe3
- 2.Qd4#
- 1...cxd2
- 2.Be5#
- 1...g2
- 2.Qf2#
- 1...g4
- 2.Sg2#
- 1...Se1
- 2.Qd4#
- 1...Sa3
- 2.Qd4#
- 1...Sd4
- 2.Qxd4#
- 1...Sg4
- 2.Sg2#
- 2.Rxf5#
- 1...Sf7
- 2.Rxf5#
- 1...Sg8
- 2.Rxf5#
- 1...c5
- 2.Qd6#
- 1...c6!
- 1...Sxa1
- 1.Ba8?
- 1...Sxa1
- 2.Qd4#
- 1...Sxe3
- 2.Qd4#
- 1...cxd2
- 2.Be5#
- 1...g2
- 2.Qf2#
- 1...g4
- 2.Sg2#
- 1...Se1
- 2.Qd4#
- 1...Sa3
- 2.Qd4#
- 1...Sd4
- 2.Qxd4#
- 1...Sg4
- 2.Sg2#
- 2.Rxf5#
- 1...Sf7
- 2.Rxf5#
- 1...Sg8
- 2.Rxf5#
- 1...c5
- 2.Qd6#
- 1...c6!
- 1...Sxa1
- 1.Rf7?
- 1...Sxa1
- 2.Qd4#
- 1...Sxe3
- 2.Qd4#
- 1...cxd2
- 2.Be5#
- 1...g2
- 2.Qf2#
- 1...g4
- 2.Sg2#
- 1...Se1
- 2.Qd4#
- 1...Sa3
- 2.Qd4#
- 1...Sd4
- 2.Qxd4#
- 1...Sg4
- 2.Sg2#
- 2.Rxf5#
- 1...Sg8
- 2.Rxf5#
- 1...Sxf7!
- 1...Sxa1
- 1.Rf8?
- 1...Sxa1
- 2.Qd4#
- 1...Sxe3
- 2.Qd4#
- 1...cxd2
- 2.Be5#
- 1...g2
- 2.Qf2#
- 1...g4
- 2.Sg2#
- 1...Se1
- 2.Qd4#
- 1...Sa3
- 2.Qd4#
- 1...Sd4
- 2.Qxd4#
- 1...Sg4
- 2.Sg2#
- 2.Rxf5#
- 1...Sg8
- 2.Rxf5#
- 1...Sf7!
- 1...Sxa1
- 1.Qd1?
- threat
- 2.Sg2#
- 2.Qf3#
- 2.Qf1#
- 1...Sxe3
- 2.Qf3#
- 2.Qd4#
- 1...g2
- 2.Qf3#
- 1...Se1
- 2.Qd4#
- 1...Sd4
- 2.Sg2#
- 2.Qxd4#
- 1...Sg4
- 2.Sg2#
- 2.Rxf5#
- 2.Qf3#
- 2.Qxg4#
- 1...g4!
- threat
- 1.Qxc2?
- threat
- 2.Qe4#
- 1...g2
- 2.Qf2#
- 1...g4!
- threat
- 1.Qe2?
- threat
- 2.Sg2#
- 2.Sd5#
- 2.Qf1#
- 2.Qf3#
- 1...Sxe3
- 2.Qf3#
- 1...g2
- 2.Qf3#
- 2.Qf2#
- 1...Se1
- 2.Sd5#
- 1...Sd4
- 2.Sg2#
- 2.Sd5#
- 1...Sg4
- 2.Sg2#
- 2.Sd5#
- 2.Rxf5#
- 2.Qf3#
- 2.Qxg4#
- 1...g4!
- threat
- 1.Qg2?
- threat
- 2.Qf1#
- 2.Qf3#
- 2.Qe4#
- 1...Sxe3
- 2.Qf3#
- 2.Qe4#
- 1...Se1
- 2.Qe4#
- 1...Sd4
- 2.Qe4#
- 1...Sg4
- 2.Sd5#
- 2.Rxf5#
- 2.Qf3#
- 2.Qe4#
- 1...g4!
- threat
- 1.Qd5?
- threat
- 2.Qf3#
- 2.Qe4#
- 2.Qe5#
- 1...Sxe3
- 2.Qf3#
- 2.Qe4#
- 2.Qd4#
- 1...g2
- 2.Qf3#
- 2.Qe5#
- 1...Se1
- 2.Qe4#
- 2.Qd4#
- 2.Qe5#
- 1...Sd4
- 2.Qe4#
- 2.Qxd4#
- 2.Qe5#
- 1...Sg4
- 2.Sg2#
- 2.Rxf5#
- 2.Qf3#
- 2.Qe4#
- 2.Qxf5#
- 1...Sf7
- 2.Rxf5#
- 2.Qf3#
- 2.Qe4#
- 2.Qxf5#
- 1...g4!
- threat
- 1.Qd7?
- threat
- 2.Qxc7#
- 1...Sxe3
- 2.Qd4#
- 1...Sg4
- 2.Sg2#
- 2.Rxf5#
- 2.Qxf5#
- 1...Sf7
- 2.Rxf5#
- 2.Qxf5#
- 1...g4!
- threat
- 1.Qd8?
- threat
- 2.Qxc7#
- 1...Sxe3
- 2.Qd4#
- 1...Sg4
- 2.Sg2#
- 2.Rxf5#
- 1...Sf7
- 2.Rxf5#
- 1...g4!
- threat
- 1.Kh1?
- Keys
- 1.Bg2!
- 1...Sxa1
- 2.Qd4#
- 1...Sxe3
- 2.Qd4#
- 1...cxd2
- 2.Be5#
- 1...g4
- 2.Sd5#
- 1...Se1
- 2.Qd4#
- 1...Sa3
- 2.Qd4#
- 1...Sd4
- 2.Qxd4#
- 1...Sg4
- 2.Sd5#
- 2.Rxf5#
- 1...Sf7
- 2.Rxf5#
- 1...Sg8
- 2.Rxf5#
- 1...c5
- 2.Qd6#
- 1...c6
- 2.Qd6#
- 1...Sxa1
- 1.Bg2!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 1
- ADDED MATES = 2
- REMOVED MATES = 1
- Sets
- S(a);N_GUARD,XB(A)::QAR2(C)
- S(a);N_GUARD::QAR2(C)
- S(a);N_GUARD,P_SPINS(a),XS(E)::QAR2(C)
- S(a);N_GUARD::QAR2(C),XS(a)
- S(h);N_GUARD::R1(H),XB(f)
- P(b);OGATE,XQ(C)::B(A)
- P(c);N_GUARD::QAR2(C)
- P(g);SBLOCK::QAB(C)+S(E),DCHECK
- Tries
- Try
- K(B);P-FLIGHT
- Vars
- S(a);N_GUARD,XB(A)::QAR2(C)
- S(a);N_GUARD,P_SPINS(a),XS(E)::QAR2(C)
- P(b);OGATE,XQ(C)::B(A)
- P(g);SBLOCK::QAB(C)+S(E),DCHECK
- S(a);N_GUARD::QAR2(C)
- S(a);N_GUARD::QAR2(C),XS(a)
- S(h);N_GUARD::R1(H),XB(f)
- Refutation
- P(c);CHECK
- Try
- S(E);CHECK,XB(f)
- Vars
- P(b);XQ(C)::R(H)+S(E),XS(h)
- Refutation
- K(e);P-FLIGHT
- Try
- B(A);
- Vars
- S(a);N_GUARD,P_SPINS(a),XS(E)::QAR2(C)
- P(b);OGATE,XQ(C)::B(A)
- P(c);N_GUARD::QAR2(C)
- P(g);SBLOCK::QAB(C)+S(E),DCHECK
- S(a);N_GUARD::QAR2(C)
- S(a);N_GUARD::QAR2(C),XS(a)
- S(h);N_GUARD::R1(H),XB(f)
- Refutation
- P(b);XB(A)
- Try
- B(A);XP(b)
- Threat
- B(A)
- Vars
- S(a);N_GUARD,P_SPINS(a),XS(E)::QAR2(C)
- S(a);N_GUARD::QAR2(C),XS(a)
- S(h);N_GUARD::R1(H),XB(f)
- Refutation
- P(d);XB(A)
- Try
- B(G);
- Vars
- S(a);N_GUARD,XB(A)::QAR2(C)
- S(a);N_GUARD,P_SPINS(a),XS(E)::QAR2(C)
- P(b);OGATE,XQ(C)::B(A)
- P(g);SBLOCK::QAB(C)+S(E),DCHECK
- S(a);N_GUARD::QAR2(C)
- S(a);N_GUARD::QAR2(C),XS(a)
- S(h);N_GUARD::R1(H),XB(f)
- P(i);N_GUARD::QAB(C)
- Refutation
- P(c);
- Try
- B(G);
- Vars
- S(a);N_GUARD,XB(A)::QAR2(C)
- S(a);N_GUARD,P_SPINS(a),XS(E)::QAR2(C)
- P(b);OGATE,XQ(C)::B(A)
- P(c);N_GUARD::QAR2(C)
- P(g);SBLOCK::QAB(C)+S(E),DCHECK
- S(a);N_GUARD::QAR2(C)
- S(a);N_GUARD::QAR2(C),XS(a)
- S(h);N_GUARD::R1(H),XB(f)
- P(i);N_GUARD::QAB(C)
- Refutation
- P(i);
- Try
- B(G);
- Vars
- S(a);N_GUARD,XB(A)::QAR2(C)
- S(a);N_GUARD,P_SPINS(a),XS(E)::QAR2(C)
- P(b);OGATE,XQ(C)::B(A)
- P(c);N_GUARD::QAR2(C)
- P(g);SBLOCK::QAB(C)+S(E),DCHECK
- S(a);N_GUARD::QAR2(C)
- S(a);N_GUARD::QAR2(C),XS(a)
- S(h);N_GUARD::R1(H),XB(f)
- P(i);N_GUARD::QAB(C)
- Refutation
- P(i);
- Try
- R(H);
- Vars
- S(a);N_GUARD,XB(A)::QAR2(C)
- S(a);N_GUARD,P_SPINS(a),XS(E)::QAR2(C)
- P(b);OGATE,XQ(C)::B(A)
- P(c);N_GUARD::QAR2(C)
- P(g);SBLOCK::QAB(C)+S(E),DCHECK
- S(a);N_GUARD::QAR2(C)
- S(a);N_GUARD::QAR2(C),XS(a)
- S(h);N_GUARD::R1(H),XB(f)
- Refutation
- S(h);N_SPINB(f),XR(H)
- Try
- R(H);
- Vars
- S(a);N_GUARD,XB(A)::QAR2(C)
- S(a);N_GUARD,P_SPINS(a),XS(E)::QAR2(C)
- P(b);OGATE,XQ(C)::B(A)
- P(c);N_GUARD::QAR2(C)
- P(g);SBLOCK::QAB(C)+S(E),DCHECK
- S(a);N_GUARD::QAR2(C)
- S(a);N_GUARD::QAR2(C),XS(a)
- S(h);N_GUARD::R1(H),XB(f)
- Refutation
- S(h);N_SPINB(f)
- Try
- Q(C);
- Threat
- DUALS(3)
- Vars
- P(c);::QAR1(C)
- S(a);N_GUARD::QAR2(C)
- Refutation
- P(g);
- Try
- Q(C);XS(a)
- Threat
- QAR1(C)
- Vars
- P(c);N_GUARD::QAR2(C)
- Refutation
- P(g);
- Try
- Q(C);
- Threat
- DUALS(4)
- Vars
- S(a);XS(E)::QAR1(C)
- S(a);::S(E)
- Refutation
- P(g);
- Try
- Q(C);
- Threat
- DUALS(3)
- Vars
- S(a);::QAR1(C)
- Refutation
- P(g);
- Try
- Q(C);
- Threat
- DUALS(3)
- Refutation
- P(g);
- Try
- Q(C);
- Threat
- QAB(C),XP(i)
- Vars
- S(a);N_GUARD,XS(E)::QAR2(C)
- Refutation
- P(g);
- Try
- Q(C);
- Threat
- QAB(C),XP(i)
- Vars
- S(a);N_GUARD,XS(E)::QAR2(C)
- S(h);N_GUARD::R1(H),XB(f)
- Refutation
- P(g);
- Try
- Actual
- B(G);
- Vars
- S(a);N_GUARD,XB(A)::QAR2(C)
- S(a);N_GUARD,P_SPINS(a),XS(E)::QAR2(C)
- P(b);OGATE,XQ(C)::B(A)
- P(g);SBLOCK::QAB(C)+S(E),DCHECK
- S(a);N_GUARD::QAR2(C)
- S(a);N_GUARD::QAR2(C),XS(a)
- S(h);N_GUARD::R1(H),XB(f)
- P(i);N_GUARD::QAB(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).