MESON Chess Problem Database
Problem Display
PID: 91951 (5B1r/7p/QP4pK/P1NB3n/1k3rR1/pPN4R/b3q3/b2n4 w - - 0 1)
Leites, Samuil Davidovich
Schach, 1974
#2
11 + 11
| 6490 | yacpdb | 2009 |
SOLUTION
- SOUND
- Sets
- 1...Qf1
- 2.Sxa2#
- 1...Qd3
- 2.Sxa2#
- 1...Qf3
- 2.Sxa2#
- 1...Qc4
- 2.Sxa2#
- 1...Qxg4
- 2.Sxa2#
- 2.Qb5#
- 1...Qb5
- 2.Sxa2#
- 2.Qxb5#
- 1...Qe1
- 2.Sxa2#
- 2.Qb5#
- 1...Qb2
- 2.Qb5#
- 1...Qc2
- 2.Qb5#
- 1...Qd2
- 2.Qb5#
- 1...Qf2
- 2.Qb5#
- 1...Qg2
- 2.Qb5#
- 1...Qh2
- 2.Qb5#
- 1...Qe3
- 2.Sxa2#
- 1...Qe4
- 2.Sxa2#
- 2.Qb5#
- 1...Qe5
- 2.Sxa2#
- 2.Qb5#
- 1...Qe6
- 2.Sxa2#
- 2.Qb5#
- 1...Qe7
- 2.Qb5#
- 1...Qe8
- 2.Sxa2#
- 1...Rc4
- 2.Qb5#
- 1...Bb2
- 2.Sxa2#
- 1...Bxc3
- 2.Sd3#
- 1...Sb2
- 2.Sxa2#
- 1...Sxc3
- 2.Sd3#
- 1...Qf1
- Tries
- 1.Sxe2?
- threat
- 2.Sd3#
- 1...Bxb3
- 2.Rxb3#
- 1...Rc4
- 2.Rxc4#
- 1...Bg7+!
- threat
- 1.S5a4+?
- 1...Qe7
- 2.Sxa2#
- 2.Bxe7#
- 2.Qb5#
- 1...Rxf8!
- 1...Qe7
- 1.Sb7+?
- 1...Qe7
- 2.Sxa2#
- 2.Bxe7#
- 2.Qb5#
- 1...Rxf8!
- 1...Qe7
- 1.Sd7+?
- 1...Qe7
- 2.Sxa2#
- 2.Bxe7#
- 2.Qb5#
- 1...Rxf8!
- 1...Qe7
- 1.Bc4?
- threat
- 2.Sd5#
- 2.Qb5#
- 1...Qxc4
- 2.Sxa2#
- 1...Rfxf8
- 2.Qb5#
- 1...Rhxf8
- 2.Qb5#
- 1...Bxc3
- 2.Sd3#
- 2.Qb5#
- 1...Sxc3
- 2.Sd3#
- 1...Qd3
- 2.Sxa2#
- 1...Qf3
- 2.Sxa2#
- 1...Qe3
- 2.Sxa2#
- 2.Sd5#
- 1...Qe7
- 2.Qb5#
- 1...Rf3
- 2.Sd5#
- 1...Sg3
- 2.Sd5#
- 1...Qd2
- 2.Qb5#
- 1...Qg2
- 2.Qb5#
- 1...Qe4
- 2.Sxa2#
- 2.Qb5#
- 1...Qe5
- 2.Sxa2#
- 2.Qb5#
- 1...Qe6
- 2.Sxa2#
- 2.Qb5#
- 1...Qe8
- 2.Sxa2#
- 2.Sd5#
- 1...Rd4
- 2.Qb5#
- 1...Rf5
- 2.Qb5#
- 1...Sf6
- 2.Qb5#
- 1...Se3!
- threat
- 1.Bd6?
- threat
- 2.S5a4#
- 2.S5e4#
- 2.Se6#
- 2.Sb7#
- 2.Sd7#
- 1...Qxa6
- 2.Sb7#
- 1...Qd3
- 2.Sxa2#
- 2.S5a4#
- 2.S5e4#
- 1...Qf3
- 2.Sxa2#
- 2.S5a4#
- 2.S5e4#
- 1...Qe3
- 2.Sxa2#
- 1...Se3
- 2.S5a4#
- 2.S5e4#
- 1...Sg3
- 2.S5a4#
- 2.S5e4#
- 1...Qc4
- 2.Sxa2#
- 1...Qb5
- 2.Sxa2#
- 2.Qxb5#
- 1...Qf2
- 2.Qb5#
- 1...Qe4
- 2.Sxa2#
- 2.S5a4#
- 2.S5xe4#
- 2.Se6#
- 2.Sb7#
- 2.Sd7#
- 2.Qb5#
- 1...Qe5
- 2.Sxa2#
- 2.Qb5#
- 1...Qe6
- 2.Sxa2#
- 2.Sxe6#
- 2.Qb5#
- 1...Qe7
- 2.Sxa2#
- 2.Qb5#
- 1...Rc4
- 2.Qb5#
- 1...Re4
- 2.S5a4#
- 2.S5xe4#
- 2.Se6#
- 2.Sb7#
- 2.Sd7#
- 1...Rd8
- 2.Sd7#
- 1...Rc8!
- threat
- 1.Rxf4+?
- 1...Qc4
- 2.Sxa2#
- 2.Rxc4#
- 2.Qb5#
- 1...Qe4
- 2.Sxa2#
- 2.Rxe4#
- 2.Qb5#
- 1...Sxf4!
- 1...Qc4
- 1.Sxe2?
- Keys
- 1.Bg8!
- threat
- 2.Sd5#
- 1...Qxa6
- 2.Sb7#
- 1...Bxc3
- 2.Sd3#
- 1...Bxb3
- 2.Se6#
- 1...Sxc3
- 2.Sd3#
- 1...Qd3
- 2.Sxa2#
- 1...Qf3
- 2.Sxa2#
- 2.S5a4#
- 1...Qe7
- 2.Qb5#
- 1...Se3
- 2.S5a4#
- 1...Qc4
- 2.Sxa2#
- 1...Qd2
- 2.Qb5#
- 1...Qg2
- 2.S5a4#
- 2.Sb7#
- 2.Sd7#
- 2.Qb5#
- 1...Qe4
- 2.Sxa2#
- 2.Qb5#
- 1...Qe5
- 2.Sxa2#
- 2.Qb5#
- 1...Qe6
- 2.Sxa2#
- 2.Qb5#
- 1...Sf6
- 2.S5e4#
- threat
- 1.Bg8!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 4
- REMOVED MATES = 12
- Sets
- Q(d);N_GUARD::S(B),XB(c)
- Q(d);N_GUARD,N_SPINR(g)::S(B),XB(c)
- Q(d);N_GUARD::QAR1(H)
- R(g);S_CUTQ(d)::QAR1(H)
- B(a);S_CUTQ(d)::S(B),XB(c)
- B(a);SBLOCK,XS(B)::B(K)+S(F),DCHECK
- S(b);S_CUTQ(d)::S(B),XB(c)
- S(b);SBLOCK,XS(B)::B(K)+S(F),DCHECK
- Tries
- Try
- S(B);XQ(d)
- Threat
- B(K)+S(F),DCHECK
- Vars
- B(c);OGATE,XP(A)::R1(C),XB(c)
- R(g);OGATE::R1(D),XR(g)
- Refutation
- B(a);CHECK
- Try
- S(F);CHECK
- Refutation
- R(k);XB(K)
- Try
- S(F);CHECK
- Refutation
- R(k);XB(K)
- Try
- S(F);CHECK
- Refutation
- R(k);XB(K)
- Try
- B(G);N_PINR(g)
- Threat
- DUALS(2)
- Vars
- Q(d);N_GUARD,XB(G)::S(B),XB(c)
- R(g);XB(K)::QAR1(H)
- R(k);XB(K)::QAR1(H)
- S(b);SBLOCK,XS(B)::B(K)+S(F),DCHECK
- Q(d);N_GUARD::S(B),XB(c)
- Q(d);::QAR1(H)
- R(g);::S(B)
- S(h);::S(B)
- R(g);::QAR1(H)
- S(h);::QAR1(H)
- Refutation
- S(b);
- Try
- B(K);
- Threat
- DUALS(5)
- Vars
- Q(d);XQ(H)::B(K)+S(F)
- Q(d);N_GUARD::S(B),XB(c)
- Q(d);N_GUARD,N_SPINR(g)::S(B),XB(c)
- Q(d);N_GUARD::QAR1(H)
- R(g);S_CUTQ(d)::QAR1(H)
- R(k);::B(K)+S(F)
- Refutation
- R(k);
- Try
- R(D);CHECK,XR(g)
- Refutation
- S(h);XR(D)
- Try
- Actual
- B(G);
- Threat
- S(B)
- Vars
- Q(d);N_GUARD,XQ(H)::B(K)+S(F)
- B(a);SBLOCK,XS(B)::B(K)+S(F),DCHECK
- B(c);SBLOCK,XP(A)::B(K)+S(F)
- S(b);SBLOCK,XS(B)::B(K)+S(F),DCHECK
- Q(d);N_GUARD::S(B),XB(c)
- Q(d);N_GUARD::QAR1(H)
- S(b);S_CUTQ(d)::B(K)+S(F)
- Q(d);N_GUARD,N_SPINR(g)::S(B),XB(c)
- S(h);::B(K)+S(F)
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).