MESON Chess Problem Database
Problem Display
PID: 16828 (rn5B/6rn/2pP4/2PkP2p/N1RN3Q/8/BK6/3R3b w - - 0 1)
Valve, Leo Erland
3rd Prize, Schackvarlden, 1943
#2
11 + 8
SOLUTION
- SOUND
- Sets
- 1...Rg1
- 2.Sc3#
- 2.Sb6#
- 2.Rcc1#
- 2.Rc2#
- 2.Rc3#
- 2.Rb4#
- 1...Rg2+
- 2.Rc2#
- 1...Rg3
- 2.Sb6#
- 2.Rc3#
- 1...Rg4
- 2.Sc3#
- 1...Rg5
- 2.Sc3#
- 2.Sb6#
- 2.Rcc1#
- 2.Rc2#
- 2.Rc3#
- 2.Rb4#
- 1...Rg6
- 2.Sc3#
- 2.Sb6#
- 2.Rcc1#
- 2.Rc2#
- 2.Rc3#
- 2.Rb4#
- 1...Rga7
- 2.Sc3#
- 2.Sb6#
- 2.Rcc1#
- 2.Rc2#
- 2.Rc3#
- 2.Rb4#
- 2.Qxh1#
- 1...Rb7+
- 2.Rb4#
- 1...Rc7
- 2.Sc3#
- 2.Sb6#
- 2.Rcc1#
- 2.Rc2#
- 2.Rc3#
- 2.Rb4#
- 2.Qxh1#
- 1...Rd7
- 2.Sc3#
- 2.Sb6#
- 2.Rcc1#
- 2.Rc2#
- 2.Rc3#
- 2.Rb4#
- 2.Qxh1#
- 1...Re7
- 2.Sc3#
- 2.Sb6#
- 2.Rcc1#
- 2.Rc2#
- 2.Rc3#
- 2.Rb4#
- 2.Qxh1#
- 1...Rf7
- 2.Sc3#
- 2.Sb6#
- 2.Rcc1#
- 2.Rc2#
- 2.Rc3#
- 2.Rb4#
- 1...Rg8
- 2.Sc3#
- 2.Sb6#
- 2.Rcc1#
- 2.Rc2#
- 2.Rc3#
- 2.Rb4#
- 1...Rg1
- Tries
- 1.Bxg7?
- threat
- 2.Sc3#
- 2.Sb6#
- 2.Rcc1#
- 2.Rc2#
- 2.Rc3#
- 2.Rb4#
- 2.Qxh1#
- 1...Rxa4
- 2.Qxh1#
- 1...Ra6
- 2.Sc3#
- 2.Rcc1#
- 2.Rc2#
- 2.Rc3#
- 2.Rb4#
- 2.Qxh1#
- 1...Bg2
- 2.Sc3#
- 2.Sb6#
- 2.Rcc1#
- 2.Rc2#
- 2.Rc3#
- 2.Rb4#
- 1...Bf3
- 2.Sc3#
- 2.Sb6#
- 2.Rcc1#
- 2.Rc2#
- 2.Rc3#
- 2.Rb4#
- 1...Be4
- 2.Sc3#
- 2.Sb6#
- 2.Rcc1#
- 2.Rc2#
- 2.Rc3#
- 2.Rb4#
- 1...Sg5
- 2.Sc3#
- 2.Sb6#
- 2.Rcc1#
- 2.Rc2#
- 2.Rc3#
- 2.Rb4#
- 1...Sd7
- 2.Sc3#
- 2.Rcc1#
- 2.Rc2#
- 2.Rc3#
- 2.Rb4#
- 2.Qxh1#
- 1...Sf6!
- threat
- 1.Re1?
- threat
- 2.Sc3#
- 2.Sb6#
- 2.Rcc1#
- 2.Rc2#
- 2.Rc3#
- 2.Rb4#
- 1...Rg2+
- 2.Rc2#
- 1...Rb7+
- 2.Rb4#
- 1...Be4
- 2.Qxe4#
- 1...Rg3
- 2.Sb6#
- 2.Rc3#
- 1...Rg4
- 2.Sc3#
- 2.Sb6#
- 2.Rb4#
- 1...Ra6
- 2.Sc3#
- 2.Rcc1#
- 2.Rc2#
- 2.Rc3#
- 2.Rb4#
- 1...Sd7
- 2.Sc3#
- 2.Rcc1#
- 2.Rc2#
- 2.Rc3#
- 2.Rb4#
- 1...Rxa4!
- threat
- 1.Qf6?
- threat
- 2.Sc3#
- 2.Sc2#
- 2.Se2#
- 2.Sf3#
- 2.Sb5#
- 2.Sf5#
- 2.Se6#
- 1...Rg2+
- 2.Se2#
- 1...Rb7+
- 2.Sb5#
- 1...Ke4
- 2.Sc2#
- 1...Rxa4
- 2.Sc2#
- 2.Se2#
- 2.Sf3#
- 2.Sb5#
- 2.Sf5#
- 2.Se6#
- 1...Rg1
- 2.Sc3#
- 1...Rg3
- 2.Sf3#
- 1...Rg4
- 2.Sc3#
- 1...Bf3
- 2.Sc3#
- 2.Se2#
- 2.Sxf3#
- 1...Be4
- 2.Sc3#
- 2.Sb6#
- 2.Rcc1#
- 2.Rc2#
- 2.Rc3#
- 2.Rb4#
- 2.Qe6#
- 1...Sxf6!
- threat
- 1.Qe7?
- threat
- 2.Sc3#
- 2.Sc2#
- 2.Se2#
- 2.Sf3#
- 2.Sb5#
- 2.Sf5#
- 1...Rg2+
- 2.Se2#
- 1...Rxe7
- 2.Sc3#
- 1...Rxa4
- 2.Sc2#
- 2.Se2#
- 2.Sf3#
- 2.Sb5#
- 2.Sf5#
- 1...Rg1
- 2.Sc3#
- 1...Rg3
- 2.Sf3#
- 1...Rg4
- 2.Sc3#
- 1...Bf3
- 2.Sc3#
- 2.Se2#
- 2.Sxf3#
- 1...Be4
- 2.Sc3#
- 2.Sb6#
- 2.Rcc1#
- 2.Rc2#
- 2.Rc3#
- 2.Rb4#
- 2.Qe6#
- 1...Ke4!
- threat
- 1.Qxh1+?
- 1...Rg2+
- 2.Qxg2#
- 1...Kxe5!
- 1...Rg2+
- 1.Qf4?
- threat
- 2.Sc3#
- 2.Sb6#
- 2.Rcc1#
- 2.Rc2#
- 2.Rc3#
- 2.Rb4#
- 1...Rg2+
- 2.Rc2#
- 1...Rb7+
- 2.Rb4#
- 1...Rg3
- 2.Sb6#
- 2.Rc3#
- 1...Ra6
- 2.Sc3#
- 2.Rcc1#
- 2.Rc2#
- 2.Rc3#
- 2.Rb4#
- 1...Sd7
- 2.Sc3#
- 2.Rcc1#
- 2.Rc2#
- 2.Rc3#
- 2.Rb4#
- 1...Rxa4!
- threat
- 1.Qg4?
- threat
- 2.Sf3#
- 1...Rb7+
- 2.Sb3#
- 2.Sb5#
- 2.Rb4#
- 1...Kxe5
- 2.Qf5#
- 1...Rxg4
- 2.Sc3#
- 1...Bf3
- 2.Sxf3#
- 1...Be4
- 2.Qe6#
- 1...hxg4!
- threat
- 1.Bxg7?
- Keys
- 1.Qh3!
- threat
- 2.Sf3#
- 1...Rg2+
- 2.Se2#
- 1...Rb7+
- 2.Sb5#
- 1...Ke4
- 2.Sxc6#
- 1...Kxe5
- 2.Qf5#
- 1...Rg1
- 2.Sc3#
- 1...Rg4
- 2.Sc3#
- 1...Bf3
- 2.Sxf3#
- 1...Be4
- 2.Qe6#
- threat
- 1.Qh3!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 2
- ADDED MATES = 5
- REMOVED MATES = 0
- Sets
- R(e);CHECK::B(B)+R(E)
- R(e);::S(D)
- Tries
- Try
- B(K);XR(e)
- Threat
- DUALS(7)
- Vars
- R(g);XS(D)::QAB(G),XB(a)
- Refutation
- S(f);
- Try
- R(A);
- Threat
- DUALS(6)
- Vars
- R(e);CHECK::B(B)+R(E)
- B(a);N_GUARD::QAB1(G),XB(a)
- Refutation
- R(g);XS(D)
- Try
- Q(G);
- Threat
- DUALS(7)
- Vars
- R(e);CHECK::R(A)+S(F)
- K(b);S_FLIGHT::R(E)+S(F)
- R(e);::S(D)
- R(e);::R(A)+S(F)
- Refutation
- S(f);XQ(G)
- Try
- Q(G);
- Threat
- DUALS(6)
- Vars
- R(e);CHECK::R(A)+S(F)
- R(e);XQ(G)::S(D)
- R(e);::S(D)
- R(e);::R(A)+S(F)
- Refutation
- K(b);S_FLIGHT
- Try
- Q(G);CHECK,XB(a)
- Vars
- R(e);CHECK,N_GUARD,P_SPINR(e)::QAB(G),XR(e)
- Refutation
- K(b);P-FLIGHT,P_SPINR(e),XP(I)
- Try
- Q(G);
- Threat
- DUALS(6)
- Vars
- R(e);CHECK::B(B)+R(E)
- Refutation
- R(g);XS(D)
- Try
- Q(G);
- Threat
- R(A)+S(F)
- Vars
- K(b);OGATEB,P-FLIGHT,P_SPINR(e),XP(I)::QAR1(G)
- R(e);XQ(G)::S(D)
- B(a);::R(A)+S(F),XB(a)
- B(a);SBLOCK::QAB1(G)
- Refutation
- P(c);XQ(G)
- Try
- Actual
- Q(G);
- Threat
- R(A)+S(F)
- Vars
- R(e);CHECK::R(A)+S(F)
- K(b);S_FLIGHT::R(E)+S(F),XP(d)
- K(b);OGATEB,P-FLIGHT,P_SPINR(e),XP(I)::QAR1(G)
- R(e);::S(D)
- B(a);::R(A)+S(F),XB(a)
- B(a);SBLOCK::QAB1(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).