MESON Chess Problem Database
Problem Display
PID: 6925 (8/6p1/3p2Q1/4p1NK/3pN3/pPPk1n1R/R3bP2/3r4 w - - 0 1)
Valve, Leo Erland
Uusi Aura, 1934
#2
9 + 9
SOLUTION
- SOUND
- Sets
- 1...Ra1
- 2.Rd2#
- 1...Rb1
- 2.Rd2#
- 1...Rc1
- 2.Rd2#
- 1...Re1
- 2.Rd2#
- 1...Rf1
- 2.Rd2#
- 1...Rg1
- 2.Rd2#
- 1...Rh1
- 2.Rd2#
- 1...Rd2
- 2.Rxd2#
- 1...Bf1
- 2.Rxf3#
- 1...dxc3
- 2.Qxd6#
- 1...d5
- 2.Qa6#
- 1...Ra1
- Tries
- 1.Kg4?
- 1...dxc3
- 2.Qxd6#
- 1...Ra1
- 2.Rd2#
- 1...Rb1
- 2.Rd2#
- 1...Rc1
- 2.Rd2#
- 1...Re1
- 2.Rd2#
- 1...Rf1
- 2.Rd2#
- 1...Rh1
- 2.Rd2#
- 1...Rd2
- 2.Rxd2#
- 1...Bf1
- 2.Rxf3#
- 1...d5
- 2.Qa6#
- 1...Rg1+!
- 1...dxc3
- 1.Sxf3?
- 1...Bxf3+
- 2.Rxf3#
- 1...dxc3
- 2.Sc5#
- 1...Ra1
- 2.Rd2#
- 1...Rb1
- 2.Rd2#
- 1...Rc1
- 2.Rd2#
- 1...Re1
- 2.Rd2#
- 1...Rf1
- 2.Rd2#
- 1...Rg1
- 2.Rd2#
- 1...Rh1
- 2.Rd2#
- 1...Rd2
- 2.Rxd2#
- 1...Bf1
- 2.Se1#
- 2.Sxe5#
- 1...d5!
- 1...Bxf3+
- 1.Sf7?
- 1...Ra1
- 2.Rd2#
- 1...Rb1
- 2.Rd2#
- 1...Rc1
- 2.Rd2#
- 1...Re1
- 2.Rd2#
- 1...Rf1
- 2.Rd2#
- 1...Rg1
- 2.Rd2#
- 1...Rh1
- 2.Rd2#
- 1...Rd2
- 2.Rxd2#
- 1...Bf1
- 2.Rxf3#
- 1...d5
- 2.Sxe5#
- 1...dxc3!
- 1...Ra1
- 1.Rg3?
- 1...dxc3
- 2.Qxd6#
- 1...Ra1
- 2.Rd2#
- 1...Rb1
- 2.Rd2#
- 1...Rc1
- 2.Rd2#
- 1...Re1
- 2.Rd2#
- 1...Rf1
- 2.Rd2#
- 1...Rg1
- 2.Rd2#
- 1...Rd2
- 2.Rxd2#
- 1...Bf1
- 2.Rxf3#
- 1...d5
- 2.Qa6#
- 1...Rh1+!
- 1...dxc3
- 1.Qe6?
- threat
- 2.Qc4#
- 1...d5
- 2.Qa6#
- 1...g6+!
- threat
- 1.c4?
- 1...Ra1
- 2.Rd2#
- 1...Rb1
- 2.Rd2#
- 1...Rc1
- 2.Rd2#
- 1...Re1
- 2.Rd2#
- 1...Rf1
- 2.Rd2#
- 1...Rg1
- 2.Rd2#
- 1...Rh1
- 2.Rd2#
- 1...Rd2
- 2.Rxd2#
- 1...Bf1
- 2.Rxf3#
- 1...d5!
- 1...Ra1
- 1.Kg4?
- Keys
- 1.Se6!
- 1...dxc3
- 2.S4c5#
- 1...Ra1
- 2.Rd2#
- 1...Rb1
- 2.Rd2#
- 1...Rc1
- 2.Rd2#
- 1...Re1
- 2.Rd2#
- 1...Rf1
- 2.Rd2#
- 1...Rg1
- 2.Rd2#
- 1...Rh1
- 2.Rd2#
- 1...Rd2
- 2.Rxd2#
- 1...Bf1
- 2.Rxf3#
- 1...d5
- 2.S6c5#
- 1...dxc3
- 1.Se6!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 2
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- R(a);N_GUARD::R1(A)
- R(a);N_GUARD,P_PINR(E)::R1(A)
- R(a);N_GUARD::R1(A),XR(a)
- B(b);N_GUARD::R(E),XS(e)
- P(f);OGATEB,XP(D)::QAR(I),XP(h)
- P(h);OGATE::QAB(I)
- Tries
- Try
- K(H);S_FLIGHT
- Vars
- P(f);OGATEB,XP(D)::QAR(I),XP(h)
- R(a);N_GUARD::R1(A)
- R(a);N_GUARD::R1(A),XR(a)
- B(b);N_GUARD::R(E),XS(e)
- P(h);OGATE::QAB(I)
- Refutation
- R(a);CHECK
- Try
- S(G);P_SPINS(G),XS(e)
- Vars
- B(b);CHECK,OGATE,P_SPINB(b),XS(G)::R(E),XB(b)
- P(f);SBLOCK,XP(D)::QAB(I)+S(F),DCHECK
- R(a);N_GUARD::R1(A)
- R(a);N_GUARD,P_PINR(E)::R1(A)
- R(a);N_GUARD::R1(A),XR(a)
- Refutation
- P(h);
- Try
- S(G);
- Vars
- R(a);N_GUARD::R1(A)
- R(a);N_GUARD,P_PINR(E)::R1(A)
- R(a);N_GUARD::R1(A),XR(a)
- B(b);N_GUARD::R(E),XS(e)
- P(h);N_GUARD::S(G),XP(g)
- Refutation
- P(f);XP(D)
- Try
- R(E);
- Vars
- P(f);OGATEB,XP(D)::QAR(I),XP(h)
- R(a);N_GUARD::R1(A)
- R(a);N_GUARD::R1(A),XR(a)
- B(b);N_GUARD::R(E),XS(e)
- P(h);OGATE::QAB(I)
- Refutation
- R(a);CHECK
- Try
- Q(I);
- Threat
- QAB1(I)
- Vars
- P(h);OGATE::QAB(I)
- Refutation
- P(i);CHECK
- Try
- P(D);
- Vars
- R(a);N_GUARD::R1(A)
- R(a);N_GUARD,P_PINR(E)::R1(A)
- R(a);N_GUARD::R1(A),XR(a)
- B(b);N_GUARD::R(E),XS(e)
- Refutation
- P(h);
- Try
- Actual
- S(G);
- Vars
- P(f);SBLOCK,XP(D)::QAB(I)+S(F),DCHECK
- R(a);N_GUARD::R1(A)
- R(a);N_GUARD,P_PINR(E)::R1(A)
- R(a);N_GUARD::R1(A),XR(a)
- B(b);N_GUARD::R(E),XS(e)
- P(h);N_GUARD::S(G)
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).