MESON Chess Problem Database
Problem Display
PID: 108467 (2K3B1/2RNp1p1/1pP2Pr1/p2np3/P1k2q1R/P4p1b/n1P2N2/B5Q1 w - - 0 1)
Isaev, Leonid Antonovich
Trud, 1927
#2
13 + 12
| 6490 | yacpdb | 2009 |
SOLUTION
- SOUND
- Sets
- 1...Qe4
- 2.Rxe4#
- 1...Rg2
- 2.Qf1#
- 1...Bf1
- 2.Qxf1#
- 1...Bg4
- 2.Qf1#
- 1...Be6
- 2.Qf1#
- 1...Bxd7+
- 2.cxd7#
- 1...Qe4
- Tries
- 1.Sxh3?
- threat
- 2.Sxe5#
- 2.Sxb6#
- 2.Qf1#
- 1...exf6
- 2.Sxb6#
- 2.Qf1#
- 1...gxf6
- 2.Sxb6#
- 2.Qf1#
- 1...Qd4
- 2.Qf1#
- 1...Qg4
- 2.Qf1#
- 1...Rg2
- 2.Sxe5#
- 2.Sxb6#
- 1...Rg4
- 2.Sxb6#
- 2.Qf1#
- 1...Rg5
- 2.Sxb6#
- 2.Qf1#
- 1...Sc1
- 2.Sxe5#
- 2.Sxb6#
- 1...Sc3
- 2.Sxe5#
- 2.Sxb6#
- 1...Sb4
- 2.Sxe5#
- 2.Sxb6#
- 1...f2
- 2.Qf1#
- 1...e4
- 2.Sxb6#
- 2.Qd4#
- 2.Qf1#
- 1...b5
- 2.Sxe5#
- 2.Sb6#
- 2.Qc5#
- 2.Qf1#
- 1...e6
- 2.Sxe5#
- 2.Qf1#
- 1...Rxg1!
- threat
- 1.Se4?
- threat
- 2.Sd2#
- 1...Bxd7+
- 2.cxd7#
- 1...Qxe4
- 2.Rxe4#
- 1...Qd2
- 2.Sxd2#
- 2.Sd6#
- 1...Rg4
- 2.Sxb6#
- 1...Bg4
- 2.Qf1#
- 1...Rg2!
- threat
- 1.Sg4?
- threat
- 2.Se3#
- 2.Sgxe5#
- 2.Sxb6#
- 1...Rxg4
- 2.Sxb6#
- 1...Bxg4
- 2.Qf1#
- 1...exf6
- 2.Se3#
- 2.Sxb6#
- 1...gxf6
- 2.Se3#
- 2.Sxb6#
- 1...Qe3
- 2.Sxe3#
- 2.Sgxe5#
- 1...Qd4
- 2.Se3#
- 2.Sgxe5#
- 1...Qf5
- 2.Se3#
- 2.Sxe5#
- 1...Rg5
- 2.Se3#
- 2.Sxb6#
- 1...Sc3
- 2.Sgxe5#
- 2.Sxb6#
- 1...f2
- 2.Se3#
- 2.Sgxe5#
- 1...e4
- 2.Sxb6#
- 2.Qd4#
- 1...b5
- 2.Se3#
- 2.Sgxe5#
- 2.Sb6#
- 2.Qc5#
- 1...e6
- 2.Sgxe5#
- 1...Qxg4!
- threat
- 1.Rxf4+?
- 1...e4
- 2.Rxe4#
- 1...exf4!
- 1...e4
- 1.Qb1?
- threat
- 2.Qxa2#
- 2.Qb3#
- 2.Qb5#
- 1...Bxd7+
- 2.cxd7#
- 1...Sc1
- 2.Qb5#
- 1...Sb4
- 2.Qb3#
- 1...b5
- 2.Qxa2#
- 2.Qb3#
- 2.Qxb5#
- 1...Sc3!
- threat
- 1.Qd1?
- threat
- 2.Bxd5#
- 2.Qd3#
- 2.Qxd5#
- 1...Bxd7+
- 2.cxd7#
- 1...Qd4
- 2.Qd3#
- 1...Bf1
- 2.Bxd5#
- 2.Qxf1#
- 2.Qxd5#
- 1...Bf5
- 2.Bxd5#
- 2.Qxd5#
- 1...Be6
- 2.Qf1#
- 2.Qd3#
- 1...Sc1
- 2.Bxd5#
- 2.Qxd5#
- 1...Sc3
- 2.Qd3#
- 1...e4
- 2.Bxd5#
- 2.Qd4#
- 2.Qxd5#
- 1...e6
- 2.Qd3#
- 1...Sb4!
- threat
- 1.Sxh3?
- Keys
- 1.Sd1!
- threat
- 2.Se3#
- 1...Bxd7+
- 2.cxd7#
- 1...Rg4
- 2.Sxb6#
- 1...Bg4
- 2.Qf1#
- 1...Be6
- 2.Qf1#
- 1...Sc3
- 2.Sb2#
- 1...e4
- 2.Qd4#
- 1...e6
- 2.Sxe5#
- threat
- 1.Sd1!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 4
- REMOVED MATES = 3
- Sets
- Q(e);OGATE::R(G),XQ(e)
- R(j);S_CUTB(c)::QAB(B)
- B(c);N_GUARD,N_PINS(K)::QAB(B),XB(c)
- B(c);N_GUARD,N_SPINQ(e)::QAB(B)
- B(c);N_GUARD,N_SPINS(g)::QAB(B)
- B(c);CHECK,OGATE,XS(K)::R(J)+P(H),XB(c)
- Tries
- Try
- S(D);N_SPINS(K),XB(c)
- Threat
- DUALS(3)
- Vars
- Q(e);::QAB(B)
- Q(e);P_PINS(K)::QAB(B)
- P(b);::QAB(B)
- Refutation
- R(j);XQ(B)
- Try
- S(D);N_PINQ(e)
- Threat
- S(D)
- Vars
- B(c);CHECK,OGATE,XS(K)::R(J)+P(H),XB(c)
- Q(e);OGATE,P_SPINQ(e),XS(D)::R(G),XQ(e)
- R(j);N_PINS(K)::S(K),XP(i)
- B(c);N_GUARD::QAB(B)
- Refutation
- R(j);
- Try
- S(D);N_PINQ(e),N_SPINS(K)
- Threat
- DUALS(3)
- Vars
- R(j);XS(D)::S(K),XP(i)
- B(c);N_GUARD,P_PINS(K),XS(D)::QAB(B)
- P(k);N_SPINS(g)::S(D),XP(h)
- Refutation
- Q(e);P_PINS(K),P_SPINQ(e),XS(D)
- Try
- R(G);CHECK,XQ(e)
- Vars
- P(h);P_SPINP(h)::R(G),XP(h)
- Refutation
- P(h);XR(G)
- Try
- Q(B);
- Threat
- DUALS(3)
- Vars
- B(c);CHECK,OGATE,XS(K)::R(J)+P(H),XB(c)
- S(a);::QAB1(B)
- Refutation
- S(a);
- Try
- Q(B);
- Threat
- DUALS(3)
- Vars
- B(c);CHECK,OGATE,XS(K)::R(J)+P(H),XB(c)
- Q(e);::QAB1(B)
- S(a);::QAB1(B)
- P(k);N_PINS(K),N_SPINS(g)::QAB1(B)
- Refutation
- S(a);
- Try
- Actual
- S(D);
- Threat
- S(D)
- Vars
- B(c);CHECK,OGATE,XS(K)::R(J)+P(H),XB(c)
- R(j);N_PINS(K),N_SPINQ(e)::S(K),XP(i)
- B(c);N_GUARD,N_SPINQ(e)::QAB(B)
- B(c);N_GUARD,N_SPINS(g)::QAB(B)
- S(a);SBLOCK::S(D)
- P(h);N_GUARD,N_SPINQ(e),S_CUTQ(e)::QAR1(B)
- P(k);N_PINS(K),N_SPINS(g)::S(K),XP(h)
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).