MESON Chess Problem Database
Problem Display
PID: 116964 (2b2rBB/2Qn1P2/2P1k2N/2qp1N2/1p1pn3/1P1P4/6p1/4R1K1 w - - 0 1)
Keirans, Arturs
Trud, 1950
#2
11 + 10
| 6490 | yacpdb | 2009 |
SOLUTION
- SOUND
- Sets
- 1...Qb6
- 2.Qd6#
- 1...Qd6
- 2.Qxd6#
- 1...Qa7
- 2.Qd6#
- 1...Qe7
- 2.Sxd4#
- 1...Qc1
- 2.Qd6#
- 1...Qc2
- 2.Qd6#
- 1...Qc3
- 2.Qd6#
- 1...Qc4
- 2.Qd6#
- 1...Qa5
- 2.Qd6#
- 1...Qb5
- 2.Qd6#
- 1...Qxc6
- 2.Qxc6#
- 1...Rxf7
- 2.Bxf7#
- 1...Rd8
- 2.f8Q#
- 2.f8S#
- 2.f8B#
- 2.f8R#
- 1...Re8
- 2.fxe8Q#
- 2.fxe8S#
- 2.fxe8B#
- 2.fxe8R#
- 2.f8Q#
- 2.f8S#
- 2.f8B#
- 2.f8R#
- 1...Rxg8
- 2.fxg8Q#
- 2.fxg8B#
- 1...Ba6
- 2.Qxd7#
- 1...Bb7
- 2.Qxd7#
- 1...Se5
- 2.Qxe5#
- 1...Sb6
- 2.Qe5#
- 1...Sf6
- 2.Sg7#
- 1...Sb8
- 2.Qe5#
- 1...Qb6
- Tries
- 1.Kxg2?
- 1...Rxg8+
- 2.fxg8Q#
- 2.fxg8B#
- 1...Qxc6
- 2.Qxc6#
- 1...Rxf7
- 2.Bxf7#
- 1...Qb6
- 2.Qd6#
- 1...Qd6
- 2.Qxd6#
- 1...Qa7
- 2.Qd6#
- 1...Qe7
- 2.Sxd4#
- 1...Qc1
- 2.Qd6#
- 1...Qc3
- 2.Qd6#
- 1...Qc4
- 2.Qd6#
- 1...Qa5
- 2.Qd6#
- 1...Qb5
- 2.Qd6#
- 1...Rd8
- 2.f8Q#
- 2.f8S#
- 2.f8B#
- 2.f8R#
- 1...Re8
- 2.fxe8Q#
- 2.fxe8S#
- 2.fxe8B#
- 2.fxe8R#
- 2.f8Q#
- 2.f8S#
- 2.f8B#
- 2.f8R#
- 1...Ba6
- 2.Qxd7#
- 1...Bb7
- 2.Qxd7#
- 1...Se5
- 2.Qxe5#
- 1...Sb6
- 2.Qe5#
- 1...Sf6
- 2.Sg7#
- 1...Sb8
- 2.Qe5#
- 1...Qc2+!
- 1...Rxg8+
- 1.Sxd4+?
- 1...Ke7
- 2.Sf5#
- 1...Qxd4+!
- 1...Ke7
- 1.Bxd4?
- 1...Qxc6
- 2.Qxc6#
- 1...Rxf7
- 2.Bxf7#
- 1...Rxg8
- 2.fxg8Q#
- 2.fxg8B#
- 1...Se5
- 2.Qxe5#
- 1...Qb6
- 2.Qd6#
- 1...Qd6
- 2.Qxd6#
- 1...Qa7
- 2.Qd6#
- 1...Qe7
- 2.Sg7#
- 1...Qc1
- 2.Qd6#
- 1...Qc2
- 2.Qd6#
- 1...Qc3
- 2.Qd6#
- 1...Qc4
- 2.Qd6#
- 1...Qa5
- 2.Qd6#
- 1...Qb5
- 2.Qd6#
- 1...Rd8
- 2.f8Q#
- 2.f8S#
- 2.f8B#
- 2.f8R#
- 1...Re8
- 2.fxe8Q#
- 2.fxe8S#
- 2.fxe8B#
- 2.fxe8R#
- 2.f8Q#
- 2.f8S#
- 2.f8B#
- 2.f8R#
- 1...Ba6
- 2.Qxd7#
- 1...Bb7
- 2.Qxd7#
- 1...Sb6
- 2.Sg7#
- 2.Qe5#
- 1...Sf6
- 2.Sg7#
- 2.Qe5#
- 1...Sb8
- 2.Sg7#
- 2.Qe5#
- 1...Qxd4+!
- 1...Qxc6
- 1.Bg7?
- 1...Qxc6
- 2.Qxc6#
- 1...Rxf7
- 2.Bxf7#
- 1...Rxg8
- 2.fxg8Q#
- 2.fxg8B#
- 1...Qb6
- 2.Qd6#
- 1...Qd6
- 2.Qxd6#
- 1...Qa7
- 2.Qd6#
- 1...Qe7
- 2.Sxd4#
- 1...Qc1
- 2.Qd6#
- 1...Qc2
- 2.Qd6#
- 1...Qc3
- 2.Qd6#
- 1...Qc4
- 2.Qd6#
- 1...Qa5
- 2.Qd6#
- 1...Qb5
- 2.Qd6#
- 1...Rd8
- 2.f8Q#
- 2.f8S#
- 2.f8B#
- 2.f8R#
- 1...Re8
- 2.fxe8Q#
- 2.fxe8S#
- 2.fxe8B#
- 2.fxe8R#
- 2.f8Q#
- 2.f8S#
- 2.f8B#
- 2.f8R#
- 1...Ba6
- 2.Qxd7#
- 1...Bb7
- 2.Qxd7#
- 1...Se5
- 2.Qxe5#
- 1...Sb6
- 2.Qe5#
- 1...Sb8
- 2.Qe5#
- 1...Sf6!
- 1...Qxc6
- 1.Re2?
- 1...Qxc6
- 2.Qxc6#
- 1...Rxf7
- 2.Bxf7#
- 1...Rxg8
- 2.fxg8Q#
- 2.fxg8B#
- 1...Qb6
- 2.Qd6#
- 1...Qd6
- 2.Qxd6#
- 1...Qa7
- 2.Qd6#
- 1...Qe7
- 2.Sxd4#
- 1...Qc2
- 2.Qd6#
- 1...Qc3
- 2.Qd6#
- 1...Qc4
- 2.Qd6#
- 1...Qa5
- 2.Qd6#
- 1...Qb5
- 2.Qd6#
- 1...Rd8
- 2.f8Q#
- 2.f8S#
- 2.f8B#
- 2.f8R#
- 1...Re8
- 2.fxe8Q#
- 2.fxe8S#
- 2.fxe8B#
- 2.fxe8R#
- 2.f8Q#
- 2.f8S#
- 2.f8B#
- 2.f8R#
- 1...Ba6
- 2.Qxd7#
- 1...Bb7
- 2.Qxd7#
- 1...Se5
- 2.Qxe5#
- 1...Sb6
- 2.Qe5#
- 1...Sf6
- 2.Sg7#
- 1...Sb8
- 2.Qe5#
- 1...Qc1+!
- 1...Qxc6
- 1.Rxe4+?
- 1...Se5
- 2.Rxe5#
- 2.Qxe5#
- 1...dxe4!
- 1...Se5
- 1.Kxg2?
- Keys
- 1.Qd8!
- 1...Qxc6
- 2.Qe7#
- 1...Rxf7
- 2.Bxf7#
- 1...Rxd8
- 2.f8Q#
- 2.f8S#
- 2.f8B#
- 2.f8R#
- 1...Rxg8
- 2.fxg8Q#
- 2.fxg8B#
- 1...Sf6
- 2.Qxf6#
- 1...Ba6
- 2.Qxd7#
- 1...Qb6
- 2.Qe7#
- 1...Qd6
- 2.Sxd4#
- 1...Qa7
- 2.Qe7#
- 1...Qe7
- 2.Qxe7#
- 1...Qc1
- 2.Qe7#
- 1...Qc2
- 2.Qe7#
- 1...Qc3
- 2.Qe7#
- 1...Qc4
- 2.Qe7#
- 1...Qa5
- 2.Qe7#
- 1...Qb5
- 2.Qe7#
- 1...Re8
- 2.fxe8Q#
- 2.fxe8S#
- 2.fxe8B#
- 2.fxe8R#
- 2.f8Q#
- 2.f8S#
- 2.f8B#
- 2.f8R#
- 1...Bb7
- 2.Qxd7#
- 1...Se5
- 2.Sg7#
- 1...Sb6
- 2.Qf6#
- 1...Sb8
- 2.Qf6#
- 1...Qxc6
- 1.Qd8!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 15
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- Q(e);N_GUARD::QAR1(H)
- Q(e);N_GUARD::QAR1(H),XQ(e)
- Q(e);N_GUARD,SBLOCK::S(E),XP(c)
- Q(e);N_GUARD,P_PINR(A)::QAR1(H)
- Q(e);OGATE,XP(F)::QAR2(H),XQ(e)
- R(j);OGATE,P_SPINR(j),XP(I)::B(J),XR(j)
- R(j);OGATE,XB(J)::PXR(j)=Q
- B(i);N_GUARD::QAB1(H),XS(h)
- S(h);N_GUARD,N_SPINS(d)::QAR1(H),XS(h)
- S(h);N_GUARD::QAR1(H)
- S(h);SBLOCK::S(E)
- Tries
- Try
- K(B);P-FLIGHT,XP(a)
- Vars
- R(j);CHECK,OGATE,XB(J)::PXR(j)=Q
- Q(e);OGATE,XP(F)::QAR2(H),XQ(e)
- R(j);OGATE,P_SPINR(j),XP(I)::B(J),XR(j)
- Q(e);N_GUARD::QAR1(H)
- Q(e);N_GUARD::QAR1(H),XQ(e)
- Q(e);N_GUARD,SBLOCK::S(E),XP(c)
- B(i);N_GUARD::QAB1(H),XS(h)
- S(h);N_GUARD,N_SPINS(d)::QAR1(H),XS(h)
- S(h);N_GUARD::QAR1(H)
- S(h);SBLOCK::S(E)
- Refutation
- Q(e);CHECK
- Try
- S(E);CHECK,P_SPINS(E),XP(c)
- Vars
- K(g);P-FLIGHT::S(G)
- Refutation
- Q(e);CHECK,XS(E)
- Try
- B(K);P_SPINB(K),XP(c)
- Vars
- Q(e);N_PINB(K),OGATE,XP(F)::QAR2(H),XQ(e)
- R(j);OGATE,P_SPINR(j),XP(I)::B(J),XR(j)
- R(j);OGATE,XB(J)::PXR(j)=Q
- S(h);N_GUARD,N_SPINS(d)::QAR1(H),XS(h)
- Q(e);N_GUARD::QAR1(H)
- Q(e);N_GUARD,N_PINB(K)::QAR1(H),XQ(e)
- Q(e);N_PINB(K),SBLOCK::S(E)
- Q(e);N_GUARD,N_PINB(K),P_PINR(A)::QAR1(H)
- Q(e);N_GUARD,N_PINB(K)::QAR1(H)
- B(i);N_GUARD::QAB1(H),XS(h)
- Refutation
- Q(e);CHECK,XB(K)
- Try
- B(K);
- Vars
- Q(e);OGATE,XP(F)::QAR2(H),XQ(e)
- R(j);OGATE,P_SPINR(j),XP(I)::B(J),XR(j)
- R(j);OGATE,XB(J)::PXR(j)=Q
- Q(e);N_GUARD::QAR1(H)
- Q(e);N_GUARD::QAR1(H),XQ(e)
- Q(e);N_GUARD,SBLOCK::S(E),XP(c)
- Q(e);N_GUARD,P_PINR(A)::QAR1(H)
- B(i);N_GUARD::QAB1(H),XS(h)
- S(h);N_GUARD,N_SPINS(d)::QAR1(H),XS(h)
- S(h);N_GUARD::QAR1(H)
- Refutation
- S(h);
- Try
- R(A);
- Vars
- Q(e);OGATE,XP(F)::QAR2(H),XQ(e)
- R(j);OGATE,P_SPINR(j),XP(I)::B(J),XR(j)
- R(j);OGATE,XB(J)::PXR(j)=Q
- Q(e);N_GUARD::QAR1(H)
- Q(e);N_GUARD::QAR1(H),XQ(e)
- Q(e);N_GUARD,SBLOCK::S(E),XP(c)
- B(i);N_GUARD::QAB1(H),XS(h)
- S(h);N_GUARD,N_SPINS(d)::QAR1(H),XS(h)
- S(h);N_GUARD::QAR1(H)
- S(h);SBLOCK::S(E)
- Refutation
- Q(e);CHECK
- Try
- R(A);CHECK,XS(d)
- Refutation
- P(f);XR(A)
- Try
- Actual
- Q(H);
- Vars
- Q(e);N_GUARD,XP(F)::QAR1(H)
- R(j);OGATE,P_SPINR(j),XP(I)::B(J),XR(j)
- R(j);OGATE,XB(J)::PXR(j)=Q
- S(h);N_GUARD::QAR1(H),XS(h)
- B(i);N_GUARD::QAB1(H),XS(h)
- Q(e);N_GUARD::QAR1(H)
- Q(e);N_GUARD,SBLOCK::S(E),XP(c)
- Q(e);N_GUARD::QAR1(H),XQ(e)
- Q(e);N_GUARD,P_PINR(A)::QAR1(H)
- S(h);N_SPINS(d),SBLOCK::S(E)
- S(h);N_GUARD::QAR1(H)
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).