MESON Chess Problem Database
Problem Display
PID: 249094 (1n3N2/4pR2/2p1Bp2/2P1kpNb/4p3/6P1/3Q3K/b7 w - - 0 1)
Gevers, Raymond
Die Schwalbe, 1929
#2
8 + 9
SOLUTION
- SOUND
- Sets
- 1...Bb2
- 2.Qxb2#
- 1...Bc3
- 2.Qxc3#
- 1...Bd4
- 2.Qf4#
- 1...Bd1
- 2.Sg6#
- 1...Be2
- 2.Sg6#
- 1...Bf3
- 2.Sg6#
- 1...Bg4
- 2.Sg6#
- 1...Bg6
- 2.Sxg6#
- 1...Bxf7
- 2.Sxf7#
- 1...Sa6
- 2.Sd7#
- 1...Sd7
- 2.Sxd7#
- 1...e3
- 2.Qxe3#
- 1...f4
- 2.gxf4#
- 1...fxg5
- 2.Rxf5#
- 1...Bb2
- Tries
- 1.Kg1?
- 1...Bxf7
- 2.Sxf7#
- 1...fxg5
- 2.Rxf5#
- 1...Bb2
- 2.Qxb2#
- 1...Bc3
- 2.Qxc3#
- 1...Bd1
- 2.Sg6#
- 1...Be2
- 2.Sg6#
- 1...Bf3
- 2.Sg6#
- 1...Bg4
- 2.Sg6#
- 1...Bg6
- 2.Sxg6#
- 1...Sa6
- 2.Sd7#
- 1...Sd7
- 2.Sxd7#
- 1...e3
- 2.Qxe3#
- 1...f4
- 2.gxf4#
- 1...Bd4+!
- 1...Bxf7
- 1.Kh1?
- 1...Bxf7
- 2.Sxf7#
- 1...fxg5
- 2.Rxf5#
- 1...Bb2
- 2.Qxb2#
- 1...Bc3
- 2.Qxc3#
- 1...Bd4
- 2.Qf4#
- 1...Bd1
- 2.Sg6#
- 1...Be2
- 2.Sg6#
- 1...Bg4
- 2.Sg6#
- 1...Bg6
- 2.Sxg6#
- 1...Sa6
- 2.Sd7#
- 1...Sd7
- 2.Sxd7#
- 1...e3
- 2.Qxe3#
- 1...f4
- 2.gxf4#
- 1...Bf3+!
- 1...Bxf7
- 1.Kg2?
- 1...Bxf7
- 2.Sxf7#
- 1...fxg5
- 2.Rxf5#
- 1...Bb2
- 2.Qxb2#
- 1...Bc3
- 2.Qxc3#
- 1...Bd4
- 2.Qf4#
- 1...Bd1
- 2.Sg6#
- 1...Be2
- 2.Sg6#
- 1...Bg4
- 2.Sg6#
- 1...Bg6
- 2.Sxg6#
- 1...Sa6
- 2.Sd7#
- 1...Sd7
- 2.Sxd7#
- 1...e3
- 2.Qxe3#
- 1...f4
- 2.gxf4#
- 1...Bf3+!
- 1...Bxf7
- 1.Kh3?
- 1...Bxf7
- 2.Sxf7#
- 1...fxg5
- 2.Rxf5#
- 1...Bb2
- 2.Qxb2#
- 1...Bc3
- 2.Qxc3#
- 1...Bd4
- 2.Qf4#
- 1...Bd1
- 2.Sg6#
- 1...Be2
- 2.Sg6#
- 1...Bf3
- 2.Sg6#
- 1...Bg6
- 2.Sxg6#
- 1...Sa6
- 2.Sd7#
- 1...Sd7
- 2.Sxd7#
- 1...e3
- 2.Qxe3#
- 1...f4
- 2.gxf4#
- 1...Bg4+!
- 1...Bxf7
- 1.Sf3+?
- 1...exf3
- 2.Qe3#
- 2.Qf4#
- 1...Bxf3!
- 1...exf3
- 1.Bd7?
- threat
- 2.Rxe7#
- 1...Bxf7
- 2.Sxf7#
- 1...fxg5
- 2.Rxf5#
- 1...e6
- 2.Qd6#
- 1...Bd4!
- threat
- 1.Bc8?
- threat
- 2.Rxe7#
- 1...Bxf7
- 2.Sxf7#
- 1...fxg5
- 2.Rxf5#
- 1...e6
- 2.Qd6#
- 1...Bd4!
- threat
- 1.Rxe7?
- threat
- 2.Ba2#
- 2.Bb3#
- 2.Bc4#
- 2.Bd5#
- 2.Bd7#
- 2.Bf7#
- 2.Bc8#
- 2.Bg8#
- 2.Qd6#
- 1...Bd4
- 2.Ba2#
- 2.Bb3#
- 2.Bc4#
- 2.Bf7#
- 2.Bg8#
- 2.Qf4#
- 1...Bf7
- 2.Sxf7#
- 2.Bxf7#
- 2.Qd6#
- 1...Sd7
- 2.Sxd7#
- 2.Ba2#
- 2.Bb3#
- 2.Bc4#
- 2.Bd5#
- 2.Bxd7#
- 2.Bf7#
- 2.Bg8#
- 2.Qd6#
- 1...f4
- 2.Bh3#
- 2.Bg4#
- 2.Bd7#
- 2.Bc8#
- 2.Qd6#
- 2.gxf4#
- 1...fxg5!
- threat
- 1.Qc1?
- threat
- 2.Qxa1#
- 1...Bb2
- 2.Qxb2#
- 1...Bc3
- 2.Qxc3#
- 1...Bd4
- 2.Qf4#
- 1...Kd4!
- threat
- 1.Qe3?
- 1...Bxf7
- 2.Sf3#
- 2.Sxf7#
- 1...fxg5
- 2.Rxf5#
- 1...Bd1
- 2.Sg6#
- 1...Bc3
- 2.Qxc3#
- 1...Bd4
- 2.Qf4#
- 1...Be2
- 2.Sg6#
- 1...Bf3
- 2.Sxf3#
- 2.Sg6#
- 1...Bg4
- 2.Sg6#
- 1...Bg6
- 2.Sf3#
- 2.Sxg6#
- 1...Sa6
- 2.Sd7#
- 1...Sd7
- 2.Sxd7#
- 1...f4
- 2.Qxe4#
- 2.gxf4#
- 1...Bb2!
- 1...Bxf7
- 1.Qf2?
- 1...Bxf7
- 2.Sxf7#
- 1...fxg5
- 2.Rxf5#
- 1...e3
- 2.Qxe3#
- 2.Qf4#
- 1...Bd1
- 2.Sg6#
- 1...Bb2
- 2.Qxb2#
- 1...Bd4
- 2.Qf4#
- 2.Qxf5#
- 1...Be2
- 2.Sg6#
- 1...Bf3
- 2.Sg6#
- 1...Bg4
- 2.Sg6#
- 1...Bg6
- 2.Sxg6#
- 1...Sa6
- 2.Sd7#
- 1...Sd7
- 2.Sxd7#
- 1...f4
- 2.gxf4#
- 1...Bc3!
- 1...Bxf7
- 1.Kg1?
- Keys
- 1.Qb4!
- 1...Bxf7
- 2.Sxf7#
- 1...fxg5
- 2.Rxf5#
- 1...Bd1
- 2.Sg6#
- 1...Bb2
- 2.Qxb2#
- 1...Bc3
- 2.Qxc3#
- 1...Bd4
- 2.Qxb8#
- 1...Be2
- 2.Sg6#
- 1...Bf3
- 2.Sg6#
- 1...Bg4
- 2.Sg6#
- 1...Bg6
- 2.Sxg6#
- 1...Sa6
- 2.Sd7#
- 1...Sd7
- 2.Sxd7#
- 1...e3
- 2.Qf4#
- 1...f4
- 2.Qxe4#
- 1...Bxf7
- 1.Qb4!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 3
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- B(a);N_GUARD::QAB(A),XB(a)
- B(a);SBLOCK::QAB1(A)
- B(e);N_GUARD::S(H)
- B(e);N_GUARD::S(H),XB(e)
- B(e);XR(G)::S(E),XB(e)
- S(i);N_GUARD::S(H)
- S(i);N_GUARD::S(H),XS(i)
- P(b);OGATEB::QAR2(A),XP(b)
- P(d);OGATE::P(C),XP(d)
- P(g);OGATE,XS(E)::R1(G),XP(d)
- Tries
- Try
- K(B);S_FLIGHT
- Vars
- B(e);XR(G)::S(E),XB(e)
- P(g);OGATE,XS(E)::R1(G),XP(d)
- B(a);N_GUARD::QAB(A),XB(a)
- B(e);N_GUARD::S(H)
- B(e);N_GUARD::S(H),XB(e)
- S(i);N_GUARD::S(H)
- S(i);N_GUARD::S(H),XS(i)
- P(b);OGATEB::QAR2(A),XP(b)
- P(d);OGATE::P(C),XP(d)
- Refutation
- B(a);CHECK
- Try
- K(B);P-FLIGHT
- Vars
- B(e);XR(G)::S(E),XB(e)
- P(g);OGATE,XS(E)::R1(G),XP(d)
- B(a);N_GUARD::QAB(A),XB(a)
- B(a);SBLOCK::QAB1(A)
- B(e);N_GUARD::S(H)
- B(e);N_GUARD::S(H),XB(e)
- S(i);N_GUARD::S(H)
- S(i);N_GUARD::S(H),XS(i)
- P(b);OGATEB::QAR2(A),XP(b)
- P(d);OGATE::P(C),XP(d)
- Refutation
- B(e);CHECK
- Try
- K(B);P-FLIGHT
- Vars
- B(e);XR(G)::S(E),XB(e)
- P(g);OGATE,XS(E)::R1(G),XP(d)
- B(a);N_GUARD::QAB(A),XB(a)
- B(a);SBLOCK::QAB1(A)
- B(e);N_GUARD::S(H)
- B(e);N_GUARD::S(H),XB(e)
- S(i);N_GUARD::S(H)
- S(i);N_GUARD::S(H),XS(i)
- P(b);OGATEB::QAR2(A),XP(b)
- P(d);OGATE::P(C),XP(d)
- Refutation
- B(e);CHECK
- Try
- K(B);P-FLIGHT
- Vars
- B(e);XR(G)::S(E),XB(e)
- P(g);OGATE,XS(E)::R1(G),XP(d)
- B(a);N_GUARD::QAB(A),XB(a)
- B(a);SBLOCK::QAB1(A)
- B(e);N_GUARD::S(H)
- B(e);N_GUARD::S(H),XB(e)
- S(i);N_GUARD::S(H)
- S(i);N_GUARD::S(H),XS(i)
- P(b);OGATEB::QAR2(A),XP(b)
- P(d);OGATE::P(C),XP(d)
- Refutation
- B(e);CHECK
- Try
- S(E);CHECK
- Refutation
- B(e);XS(E)
- Try
- B(F);
- Threat
- R(G),XP(h)
- Vars
- B(e);XR(G)::S(E),XB(e)
- P(g);OGATE,XS(E)::R1(G),XP(d)
- P(h);N_GUARD::QAB1(A)
- Refutation
- B(a);
- Try
- B(F);
- Threat
- R(G),XP(h)
- Vars
- B(e);XR(G)::S(E),XB(e)
- P(g);OGATE,XS(E)::R1(G),XP(d)
- P(h);N_GUARD::QAB1(A)
- Refutation
- B(a);
- Try
- R(G);XP(h)
- Threat
- DUALS(9)
- Refutation
- P(g);XS(E)
- Try
- Q(A);
- Threat
- QAB(A),XB(a)
- Vars
- B(a);N_GUARD::QAB(A),XB(a)
- B(a);SBLOCK::QAB1(A)
- Refutation
- K(c);S_FLIGHT
- Try
- Q(A);P_PINP(b)
- Vars
- P(g);OGATE,XS(E)::R1(G),XP(d)
- B(e);N_GUARD::S(H)
- B(a);N_GUARD::QAB(A),XB(a)
- B(a);SBLOCK::QAB1(A)
- S(i);N_GUARD::S(H)
- S(i);N_GUARD::S(H),XS(i)
- Refutation
- B(a);
- Try
- Q(A);
- Vars
- B(e);XR(G)::S(E),XB(e)
- P(g);OGATE,XS(E)::R1(G),XP(d)
- B(e);N_GUARD::S(H)
- B(a);N_GUARD::QAB(A),XB(a)
- B(e);N_GUARD::S(H),XB(e)
- S(i);N_GUARD::S(H)
- S(i);N_GUARD::S(H),XS(i)
- P(d);OGATE::P(C),XP(d)
- Refutation
- B(a);
- Try
- Actual
- Q(A);
- Vars
- B(e);XR(G)::S(E),XB(e)
- P(g);OGATE,XS(E)::R1(G),XP(d)
- B(e);N_GUARD::S(H)
- B(a);N_GUARD::QAB(A),XB(a)
- B(a);SBLOCK::QAB(A),XS(i)
- B(e);N_GUARD::S(H),XB(e)
- S(i);N_GUARD::S(H)
- S(i);N_GUARD::S(H),XS(i)
- P(b);OGATE::QAB1(A)
- P(d);N_GUARD::QAR1(A),XP(b)
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).