MESON Chess Problem Database
Problem Display
PID: 41794 (8/Q3p1pR/3n2KN/Rp1rk1Np/4P3/3p2P1/3P4/8 w - - 0 1)
Gevers, Raymond
De Problemist, 1929
#2
9 + 8
SOLUTION
- SOUND
- Sets
- 1...Rd4
- 2.Qxe7#
- 1...Rc5
- 2.Qxc5#
- 1...Sc4
- 2.Shf7#
- 1...Sxe4
- 2.Shf7#
- 1...Sf5
- 2.Shf7#
- 1...Sb7
- 2.Shf7#
- 1...Sf7
- 2.Shxf7#
- 1...Sc8
- 2.Shf7#
- 1...Se8
- 2.Shf7#
- 1...b4
- 2.Rxd5#
- 1...h4
- 2.Sg4#
- 1...e6
- 2.Qxg7#
- 1...gxh6
- 2.Rxe7#
- 1...Rd4
- Tries
- 1.Sf3+?
- 1...Kxe4
- 2.Qe3#
- 1...Ke6!
- 1...Kxe4
- 1.Ra1?
- 1...Sxe4
- 2.Shf7#
- 1...gxh6
- 2.Rxe7#
- 1...Rc5
- 2.Qxc5#
- 1...Sc4
- 2.Shf7#
- 1...Sf5
- 2.Shf7#
- 1...Sb7
- 2.Shf7#
- 1...Sf7
- 2.Shxf7#
- 1...Sc8
- 2.Shf7#
- 1...Se8
- 2.Shf7#
- 1...Rd4
- 2.Qxe7#
- 1...h4
- 2.Sg4#
- 1...e6
- 2.Qxg7#
- 1...b4!
- 1...Sxe4
- 1.Ra2?
- 1...Sxe4
- 2.Shf7#
- 1...gxh6
- 2.Rxe7#
- 1...Rc5
- 2.Qxc5#
- 1...Sc4
- 2.Shf7#
- 1...Sf5
- 2.Shf7#
- 1...Sb7
- 2.Shf7#
- 1...Sf7
- 2.Shxf7#
- 1...Sc8
- 2.Shf7#
- 1...Se8
- 2.Shf7#
- 1...Rd4
- 2.Qxe7#
- 1...h4
- 2.Sg4#
- 1...e6
- 2.Qxg7#
- 1...b4!
- 1...Sxe4
- 1.Ra3?
- 1...Sxe4
- 2.Shf7#
- 1...gxh6
- 2.Rxe7#
- 1...Rc5
- 2.Qxc5#
- 1...Sc4
- 2.Shf7#
- 1...Sf5
- 2.Shf7#
- 1...Sb7
- 2.Shf7#
- 1...Sf7
- 2.Shxf7#
- 1...Sc8
- 2.Shf7#
- 1...Se8
- 2.Shf7#
- 1...Rd4
- 2.Qxe7#
- 1...h4
- 2.Sg4#
- 1...e6
- 2.Qxg7#
- 1...b4!
- 1...Sxe4
- 1.Rxb5?
- threat
- 2.Rxd5#
- 2.Qa1#
- 1...Sxe4
- 2.Shf7#
- 1...Sxb5
- 2.Shf7#
- 1...Rc5
- 2.Qxc5#
- 2.Qa1#
- 1...Sc4
- 2.Shf7#
- 2.Rxd5#
- 1...Sf5
- 2.Shf7#
- 2.Rxd5#
- 1...Sb7
- 2.Shf7#
- 2.Rxd5#
- 1...Sf7
- 2.Shxf7#
- 2.Rxd5#
- 1...Sc8
- 2.Shf7#
- 2.Rxd5#
- 1...Se8
- 2.Shf7#
- 2.Rxd5#
- 1...e6
- 2.Qa1#
- 2.Qxg7#
- 1...Rxb5!
- threat
- 1.Ra6?
- 1...Sxe4
- 2.Sf3#
- 2.Sgf7#
- 2.Shf7#
- 2.Re6#
- 1...gxh6
- 2.Rxe7#
- 1...Rc5
- 2.Qxc5#
- 1...Rd4
- 2.Qxe7#
- 1...Sc4
- 2.Shf7#
- 2.Re6#
- 1...Sf5
- 2.Shf7#
- 2.Re6#
- 1...Sb7
- 2.Shf7#
- 2.Re6#
- 1...Sf7
- 2.Shxf7#
- 2.Re6#
- 1...Sc8
- 2.Shf7#
- 2.Re6#
- 1...Se8
- 2.Shf7#
- 2.Re6#
- 1...h4
- 2.Sg4#
- 1...e6
- 2.Qxg7#
- 1...b4!
- 1...Sxe4
- 1.Rxg7?
- threat
- 2.Rxe7#
- 1...Sxe4
- 2.Shf7#
- 1...Rc5
- 2.Qxc5#
- 1...Sc4
- 2.Shf7#
- 1...Sf5
- 2.Shf7#
- 1...Sb7
- 2.Shf7#
- 1...Sf7
- 2.Shxf7#
- 1...Sc8
- 2.Shf7#
- 1...Se8
- 2.Shf7#
- 1...e6!
- threat
- 1.Rh8?
- 1...Sxe4
- 2.Shf7#
- 1...Rc5
- 2.Qxc5#
- 1...Sc4
- 2.Shf7#
- 1...Sf5
- 2.Shf7#
- 1...Sb7
- 2.Shf7#
- 1...Sf7
- 2.Shxf7#
- 1...Sc8
- 2.Shf7#
- 1...Se8
- 2.Shf7#
- 1...b4
- 2.Rxd5#
- 1...Rd4
- 2.Qxe7#
- 1...h4
- 2.Sg4#
- 1...e6
- 2.Qxg7#
- 1...gxh6!
- 1...Sxe4
- 1.Qf2?
- 1...Sxe4
- 2.Shf7#
- 1...gxh6
- 2.Rxe7#
- 1...Sc4
- 2.Shf7#
- 1...Sf5
- 2.Shf7#
- 1...Sb7
- 2.Shf7#
- 1...Sf7
- 2.Shxf7#
- 1...Sc8
- 2.Shf7#
- 1...Se8
- 2.Shf7#
- 1...b4
- 2.Rxd5#
- 1...Rd4
- 2.Qf4#
- 1...Rc5
- 2.Qxc5#
- 1...h4
- 2.Sg4#
- 1...e6!
- 1...Sxe4
- 1.Sf3+?
- Keys
- 1.Qe3!
- 1...Sxe4
- 2.Shf7#
- 1...gxh6
- 2.Rxe7#
- 1...Sc4
- 2.Shf7#
- 1...Sf5
- 2.Shf7#
- 1...Sb7
- 2.Shf7#
- 1...Sf7
- 2.Shxf7#
- 1...Sc8
- 2.Shf7#
- 1...Se8
- 2.Shf7#
- 1...b4
- 2.Rxd5#
- 1...Rd4
- 2.Qf4#
- 1...Rc5
- 2.Qxc5#
- 1...h4
- 2.Sg4#
- 1...e6
- 2.Sf3#
- 1...Sxe4
- 1.Qe3!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 2
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- R(c);P_SPINP(b),SBLOCK::QAR2(H),XP(g)
- R(c);OGATEB::QAR2(H),XR(c)
- S(f);N_GUARD::S(G)
- S(f);N_GUARD,XP(C)::S(G)
- S(f);N_GUARD::S(G),XS(f)
- P(b);OGATE,P_SPINR(c)::R1(D),XR(c)
- P(e);N_GUARD::S(G)
- P(g);OGATE::QAB(H),XP(h)
- P(h);OGATE,XS(G)::R(I),XP(g)
- Tries
- Try
- S(E);CHECK
- Vars
- K(d);P-FLIGHT,XP(C)::QAR1(H)
- Refutation
- K(d);P-FLIGHT
- Try
- R(D);
- Vars
- S(f);N_GUARD,XP(C)::S(G)
- P(h);OGATE,XS(G)::R(I),XP(g)
- R(c);OGATEB::QAR2(H),XR(c)
- S(f);N_GUARD::S(G)
- S(f);N_GUARD::S(G),XS(f)
- R(c);SBLOCK::QAR2(H),XP(g)
- P(e);N_GUARD::S(G)
- P(g);OGATE::QAB(H),XP(h)
- Refutation
- P(b);
- Try
- R(D);
- Vars
- S(f);N_GUARD,XP(C)::S(G)
- P(h);OGATE,XS(G)::R(I),XP(g)
- R(c);OGATEB::QAR2(H),XR(c)
- S(f);N_GUARD::S(G)
- S(f);N_GUARD::S(G),XS(f)
- R(c);SBLOCK::QAR2(H),XP(g)
- P(e);N_GUARD::S(G)
- P(g);OGATE::QAB(H),XP(h)
- Refutation
- P(b);
- Try
- R(D);
- Vars
- S(f);N_GUARD,XP(C)::S(G)
- P(h);OGATE,XS(G)::R(I),XP(g)
- R(c);OGATEB::QAR2(H),XR(c)
- S(f);N_GUARD::S(G)
- S(f);N_GUARD::S(G),XS(f)
- R(c);SBLOCK::QAR2(H),XP(g)
- P(e);N_GUARD::S(G)
- P(g);OGATE::QAB(H),XP(h)
- Refutation
- P(b);
- Try
- R(D);P_PINR(c),XP(b)
- Threat
- DUALS(2)
- Vars
- S(f);N_GUARD,XP(C)::S(G)
- S(f);N_GUARD,N_SPINR(c),XR(D)::S(G)
- Refutation
- R(c);N_SPINR(c),XR(D)
- Try
- R(D);
- Vars
- P(h);OGATE,XS(G)::R(I),XP(g)
- R(c);OGATEB::QAR2(H),XR(c)
- R(c);SBLOCK::QAR2(H),XP(g)
- P(e);N_GUARD::S(G)
- P(g);OGATE::QAB(H),XP(h)
- Refutation
- P(b);
- Try
- R(I);XP(h)
- Threat
- R(I),XP(g)
- Vars
- S(f);N_GUARD,XP(C)::S(G)
- R(c);OGATEB::QAR2(H),XR(c)
- S(f);N_GUARD::S(G)
- S(f);N_GUARD::S(G),XS(f)
- Refutation
- P(g);
- Try
- R(I);
- Vars
- S(f);N_GUARD,XP(C)::S(G)
- R(c);OGATEB::QAR2(H),XR(c)
- S(f);N_GUARD::S(G)
- S(f);N_GUARD::S(G),XS(f)
- P(b);OGATE,P_SPINR(c)::R1(D),XR(c)
- R(c);P_SPINP(b),SBLOCK::QAR2(H),XP(g)
- P(e);N_GUARD::S(G)
- P(g);OGATE::QAB(H),XP(h)
- Refutation
- P(h);XS(G)
- Try
- Q(H);
- Vars
- S(f);N_GUARD,XP(C)::S(G)
- P(h);OGATE,XS(G)::R(I),XP(g)
- S(f);N_GUARD::S(G)
- S(f);N_GUARD::S(G),XS(f)
- P(b);OGATE,P_SPINR(c)::R1(D),XR(c)
- R(c);P_SPINP(b),SBLOCK::QAB1(H)
- R(c);OGATEB::QAR2(H),XR(c)
- P(e);N_GUARD::S(G)
- Refutation
- P(g);
- Try
- Actual
- Q(H);
- Vars
- S(f);N_GUARD,P_SPINS(f),XP(C)::S(G)
- P(h);OGATE,XS(G)::R(I),XP(g)
- S(f);N_GUARD::S(G)
- S(f);N_GUARD::S(G),XS(f)
- P(b);OGATE,P_SPINR(c)::R1(D),XR(c)
- R(c);P_SPINP(b),SBLOCK::QAB1(H)
- R(c);OGATEB::QAR2(H),XR(c)
- P(e);N_GUARD::S(G)
- P(g);SBLOCK::S(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).