MESON Chess Problem Database
Problem Display
PID: 12112 (8/1R1pp3/KQp4b/3R3N/pP2k1P1/5pPp/BBn2p1q/r4N2 w - - 0 1)
Opalek, Cyril
Zemedelske noviny, 1974
#2
11 + 12
SOLUTION
- SOUND
- Sets
- 1...Qxg3
- 2.Sfxg3#
- 1...Bd2
- 2.Sxd2#
- 1...Bg7
- 2.Sd2#
- 1...Bf8
- 2.Sd2#
- 1...Se1
- 2.Qd4#
- 1...Sa3
- 2.Qd4#
- 1...Se3
- 2.Sd2#
- 2.Qd4#
- 1...Sxb4+
- 2.Qxb4#
- 1...Sd4
- 2.Qxd4#
- 1...cxd5
- 2.Qg6#
- 1...c5
- 2.Qg6#
- 1...d6
- 2.Rxe7#
- 1...e5
- 2.Sf6#
- 1...e6
- 2.Sf6#
- 1...Qxg3
- Tries
- 1.Rd4+?
- 1...Sxd4
- 2.Qxd4#
- 1...Ke5!
- 1...Sxd4
- 1.Rbxd7?
- threat
- 2.Re5#
- 2.Rxe7#
- 1...Sxb4+
- 2.Qxb4#
- 1...Qxg3
- 2.Sfxg3#
- 1...Rxa2
- 2.Re5#
- 1...cxd5
- 2.Qg6#
- 1...Sd4
- 2.Qxd4#
- 1...Bg5
- 2.Re5#
- 1...Bg7
- 2.Sd2#
- 1...Bf8
- 2.Sd2#
- 2.Re5#
- 1...e5
- 2.Sf6#
- 2.Rxe5#
- 1...e6
- 2.Sf6#
- 2.Re5#
- 1...Bf4!
- threat
- 1.Qe3+?
- 1...Sxe3
- 2.Sd2#
- 1...Bxe3!
- 1...Sxe3
- 1.Qc5?
- threat
- 2.Qxe7#
- 2.Qxc2#
- 1...Sxb4+
- 2.Rxb4#
- 2.Qxb4#
- 1...Qxg3
- 2.Sfxg3#
- 2.Qxc2#
- 1...Rxf1
- 2.Qxe7#
- 1...cxd5
- 2.Qxc2#
- 2.Qxd5#
- 1...Sd4
- 2.Rxd4#
- 2.Qxd4#
- 1...Bf4
- 2.Qxc2#
- 1...Rc1
- 2.Qxe7#
- 1...Rd1
- 2.Qxe7#
- 1...Bg5
- 2.Qxc2#
- 1...Bg7
- 2.Sd2#
- 2.Qxc2#
- 1...Bf8
- 2.Sd2#
- 2.Qxc2#
- 1...Se1
- 2.Rd4#
- 2.Qd4#
- 2.Qxe7#
- 2.Qc4#
- 1...Sa3
- 2.Rd4#
- 2.Qd4#
- 2.Qxe7#
- 1...Se3
- 2.Sd2#
- 2.Rd4#
- 2.Qd4#
- 2.Qxe7#
- 1...d6
- 2.Rxe7#
- 2.Qxc2#
- 1...e5
- 2.Sf6#
- 2.Qxc2#
- 1...e6
- 2.Sf6#
- 2.Qxc2#
- 1...Rxa2!
- threat
- 1.Qb5?
- threat
- 2.Re5#
- 2.Qd3#
- 1...Sxb4+
- 2.Qxb4#
- 1...Qxg3
- 2.Qd3#
- 1...cxd5
- 2.Bxd5#
- 2.Qxd5#
- 1...Bf4
- 2.Qd3#
- 1...Rd1
- 2.Re5#
- 1...Bg7
- 2.Qd3#
- 1...Se1
- 2.Rd4#
- 2.Re5#
- 2.Qc4#
- 1...Sd4
- 2.Rxd4#
- 2.Re5#
- 1...d6
- 2.Rxe7#
- 2.Qd3#
- 1...e5
- 2.Sf6#
- 2.Rxe5#
- 2.Qd3#
- 1...cxb5!
- threat
- 1.Rd4+?
- Keys
- 1.Qc7!
- threat
- 2.Qe5#
- 1...Sxb4+
- 2.Rxb4#
- 1...Qxg3
- 2.Shxg3#
- 1...cxd5
- 2.Qxc2#
- 1...Sd4
- 2.Rxd4#
- 1...Bf4
- 2.Qxf4#
- 1...Bg7
- 2.Qf4#
- 1...d6
- 2.Qxe7#
- 1...e5
- 2.Sf6#
- 2.Qxe5#
- threat
- 1.Qc7!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 6
- ADDED MATES = 1
- REMOVED MATES = 7
- Sets
- Q(d);XP(D)::S(A),XQ(d)
- B(j);N_GUARD::S(A),XB(j)
- B(j);N_GUARD::S(A)
- S(b);N_GUARD::QAR1(J)
- S(b);CHECK,OGATE,XP(E)::QAR(J),XS(b)
- S(b);N_GUARD::QAR1(J),XS(b)
- P(i);OGATE,XR(G)::QAB(J)
- P(i);OGATE::QAB(J)
- P(k);OGATE::R(K),XP(l)
- P(l);N_GUARD::S(H)
- Tries
- Try
- R(G);CHECK
- Vars
- S(b);OGATE,XR(G)::QAR1(J),XS(b)
- Refutation
- K(h);P-FLIGHT
- Try
- R(K);XP(k)
- Threat
- DUALS(2)
- Vars
- S(b);CHECK,OGATE,XP(E)::QAR(J),XS(b)
- Q(d);XP(D)::S(A),XQ(d)
- R(a);XB(B)::R1(G)
- P(i);OGATE,XR(G)::QAB(J)
- S(b);N_GUARD::QAR1(J),XS(b)
- B(j);::R1(G)
- B(j);N_GUARD::S(A)
- Refutation
- B(j);
- Try
- Q(J);CHECK
- Vars
- S(b);SBLOCK,XQ(J)::S(A)
- Refutation
- B(j);XQ(J)
- Try
- Q(J);
- Threat
- DUALS(2)
- Vars
- R(a);XS(A)::QAR(J),XP(l)
- B(j);::QAB(J),XS(b)
- R(a);::QAR(J),XP(l)
- Refutation
- R(a);XB(B)
- Try
- Q(J);
- Threat
- DUALS(2)
- Vars
- S(b);CHECK,OGATE,XP(E)::QAR(J),XS(b)
- Q(d);XP(D)::QAB1(J)
- B(j);::QAB1(J)
- R(a);::R1(G)
- Refutation
- P(i);XQ(J)
- Try
- Actual
- Q(J);
- Threat
- QAR1(J)
- Vars
- S(b);CHECK,OGATE,XP(E)::R(K),XS(b)
- Q(d);XP(D)::S(H),XQ(d)
- P(i);OGATE,XR(G)::QAB(J),XS(b)
- S(b);N_GUARD::R1(G),XS(b)
- B(j);N_GUARD::QAR1(J),XB(j)
- B(j);N_GUARD::QAR1(J)
- P(k);OGATE::QAR(J),XP(l)
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).