MESON Chess Problem Database
Problem Display
PID: 162338 (2N5/4qBPK/b1p5/r4RRN/4kP1p/p4p2/Q1PPnB2/8 w - - 0 1)
Alekseev, Yuri Mikhailovich
Schach, 1982
#2
12 + 9
| 15148 | Sadier Collection | 2017 |
SOLUTION
- SOUND
- Sets
- 1...Qb4
- 2.Sf6#
- 1...Qc5
- 2.Sf6#
- 1...Qxg5
- 2.Sd6#
- 1...Qd6
- 2.Sxd6#
- 1...Qf6
- 2.Sxf6#
- 1...Qf8
- 2.Sf6#
- 1...Qa7
- 2.Sf6#
- 2.Sd6#
- 1...Qb7
- 2.Sf6#
- 2.Sd6#
- 1...Qc7
- 2.Sf6#
- 1...Qd7
- 2.Sf6#
- 1...Qxf7
- 2.Sd6#
- 1...Qe8
- 2.Sf6#
- 2.Sd6#
- 1...Rb5
- 2.d3#
- 1...Bb7
- 2.d3#
- 1...Bxc8
- 2.d3#
- 1...Sxf4
- 2.Rxf4#
- 1...c5
- 2.Bd5#
- 2.Qd5#
- 1...Qb4
- Tries
- 1.Bg6?
- threat
- 2.Rxa5#
- 2.Rb5#
- 2.Rc5#
- 2.Rd5#
- 2.Re5#
- 1...Qxg5
- 2.Sd6#
- 2.Re5#
- 1...Rxf5
- 2.Bxf5#
- 1...Bxc8
- 2.Re5#
- 2.d3#
- 1...Sxf4
- 2.Rxf4#
- 2.Re5#
- 1...Qc5
- 2.Sf6#
- 2.Rxc5#
- 2.Rd5#
- 2.Re5#
- 1...Qd6
- 2.Sxd6#
- 2.Re5#
- 1...Qf6
- 2.Sxf6#
- 2.Re5#
- 1...Qf8
- 2.Re5#
- 1...Qe5
- 2.Rxe5#
- 1...Qe6
- 2.Re5#
- 1...Qd7
- 2.Sf6#
- 2.Re5#
- 1...Qf7
- 2.Sd6#
- 2.Re5#
- 1...Qe8
- 2.Sf6#
- 2.Sd6#
- 2.Re5#
- 1...Ra4
- 2.Ra5#
- 2.Rb5#
- 2.Rc5#
- 2.Rd5#
- 2.Re5#
- 2.Rf6#
- 2.Rf7#
- 2.Rf8#
- 1...Rb5
- 2.Rxb5#
- 2.Rc5#
- 2.Rd5#
- 2.Re5#
- 2.d3#
- 1...Rc5
- 2.Rxc5#
- 2.Rd5#
- 2.Re5#
- 1...Rd5
- 2.Rxd5#
- 2.Re5#
- 1...Re5
- 2.Rxe5#
- 1...Bb5
- 2.Rxb5#
- 2.Rc5#
- 2.Rd5#
- 2.Re5#
- 2.Rf6#
- 2.Rf7#
- 2.Rf8#
- 1...Sg3
- 2.Re5#
- 1...Sd4
- 2.Re5#
- 1...c5
- 2.Rxc5#
- 2.Rd5#
- 2.Re5#
- 2.Rf6#
- 2.Rf7#
- 2.Rf8#
- 2.Qd5#
- 1...Qxg7+!
- threat
- 1.Qb3?
- threat
- 2.Qe3#
- 1...Qxg5
- 2.Sd6#
- 1...Qc5
- 2.Sf6#
- 1...Qa7
- 2.Sf6#
- 2.Sd6#
- 1...Bd3
- 2.Qxd3#
- 2.cxd3#
- 1...Sc3!
- threat
- 1.Qc4+?
- 1...Sd4
- 2.Qxd4#
- 2.d3#
- 1...Bxc4!
- 1...Sd4
- 1.Qe6+?
- 1...Re5
- 2.Rxe5#
- 1...Qxe6!
- 1...Re5
- 1.Bg6?
- Keys
- 1.Rb5!
- threat
- 2.Bg6#
- 2.d3#
- 1...Qxg5
- 2.Sd6#
- 2.d3#
- 1...Qxf7
- 2.Sd6#
- 2.Rge5#
- 2.d3#
- 1...Rxb5
- 2.d3#
- 1...Bxb5
- 2.Bg6#
- 1...Bxc8
- 2.d3#
- 1...Sxf4
- 2.Qc4#
- 1...Qc5
- 2.d3#
- 1...Qd6
- 2.Sxd6#
- 1...Qf6
- 2.d3#
- 1...Qd8
- 2.Bg6#
- 2.Rge5#
- 2.Qe6#
- 1...Qf8
- 2.Rge5#
- 2.Qe6#
- 2.d3#
- 1...Qe5
- 2.Rgxe5#
- 2.d3#
- 1...Qe6
- 2.Qxe6#
- 2.d3#
- 1...Qd7
- 2.Rge5#
- 1...Qe8
- 2.Sd6#
- 2.d3#
- 1...Sc1
- 2.Bg6#
- 2.Qc4#
- 1...Sg3
- 2.Qc4#
- 2.d3#
- 1...Sd4
- 2.d3#
- threat
- 1.Rb5!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 4
- ADDED MATES = 2
- REMOVED MATES = 6
- Sets
- Q(i);N_GUARD::S(H)
- Q(i);N_GUARD,XR(G)::S(L)
- Q(i);N_GUARD::S(L),XQ(i)
- Q(i);N_GUARD::S(H),XQ(i)
- Q(i);N_GUARD,P_PINP(J),XB(I)::S(L)
- R(f);S_CUTB(g)::P(C)
- B(g);N_GUARD::P(C)
- B(g);N_GUARD,XS(L)::P(C)
- S(a);OGATE,XP(E)::R1(F),XS(a)
- Tries
- Try
- B(I);P_SPINP(J)
- Threat
- DUALS(5)
- Vars
- R(f);OGATE,P_SPINR(f),XR(F)::B(I),XR(f)
- Q(i);N_PINP(J)::B(I)+R(F),DCHECK
- Q(i);N_PINP(J)::B(I)+R(F),DCHECK,XQ(i)
- R(f);::B(I)+R(F),DCHECK,XR(f)
- S(a);::B(I)+R(F),DCHECK
- Refutation
- Q(i);CHECK,XP(J)
- Try
- Q(A);
- Threat
- QAR1(A)
- Vars
- Q(i);N_GUARD,XR(G)::S(L)
- Q(i);N_GUARD::S(H)
- Refutation
- S(a);
- Try
- Q(A);CHECK
- Refutation
- B(g);XQ(A)
- Try
- Q(A);CHECK
- Vars
- R(f);N_GUARD,P_SPINR(f)::R1(F),XR(f)
- Refutation
- Q(i);XQ(A)
- Try
- Actual
- R(F);
- Threat
- DUALS(2)
- Vars
- R(f);XR(F)::P(C)
- B(g);XR(F)::B(I)
- B(g);XS(L)::P(C)
- S(a);N_GUARD,XP(E)::QAR2(A)
- Q(i);::P(C)
- Q(i);N_GUARD::S(L),XQ(i)
- Q(i);N_GUARD::R1(G)
- S(a);::P(C)
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).