MESON Chess Problem Database
Problem Display
PID: 228829 (5n1K/r2P2n1/2pP4/2P1k1P1/1p4pN/1B2P1p1/1NQ4b/B6q w - - 0 1)
Kofman, Rafael Moiseevich
1st Prize, Revista de Sah, 1926
#2
11 + 10
| 6490 | yacpdb | 2020 |
SOLUTION
- SOUND
- Sets
- 1...Qg2
- 2.Sa4#
- 1...Qf3
- 2.Sa4#
- 1...Qe4
- 2.Sd3#
- 1...Rb7
- 2.Sd1#
- 1...Rc7
- 2.Sd1#
- 1...Rxd7
- 2.Sd1#
- 1...Bg1
- 2.Sa4#
- 1...Sf5
- 2.Qxf5#
- 1...Sh5
- 2.Qf5#
- 1...Sge6
- 2.Qf5#
- 1...Se8
- 2.Qf5#
- 1...Sfe6
- 2.Sg6#
- 1...Sg6+
- 2.Sxg6#
- 1...Sxd7
- 2.Sg6#
- 1...Sh7
- 2.Sg6#
- 1...Qg2
- Tries
- 1.Sc4+?
- 1...Kd5
- 2.Sd2#
- 2.Sa3#
- 2.Sa5#
- 2.Se5#
- 2.Sb6#
- 1...Ke6!
- 1...Kd5
- 1.Sf3+?
- 1...Qxf3
- 2.Sa4#
- 1...gxf3!
- 1...Qxf3
- 1.Bf7?
- threat
- 2.Sc4#
- 1...Sg6+
- 2.Sxg6#
- 1...Sge6
- 2.Qf5#
- 1...Sfe6!
- threat
- 1.Bg8?
- threat
- 2.Sc4#
- 1...Sg6+
- 2.Sxg6#
- 1...Sge6
- 2.Qf5#
- 1...Sfe6!
- threat
- 1.Qe4+?
- 1...Qxe4
- 2.Sd3#
- 1...Kxe4!
- 1...Qxe4
- 1.Qg6?
- threat
- 2.Sd3#
- 1...Sf5
- 2.Qxf5#
- 1...Sxg6+!
- threat
- 1.Qc3+?
- 1...Ke4
- 2.Qd4#
- 1...bxc3!
- 1...Ke4
- 1.d8Q?
- threat
- 2.Qf6#
- 1...Sg6+
- 2.Sxg6#
- 1...Qf3
- 2.Sa4#
- 1...Re7
- 2.Sd1#
- 1...Rf7
- 2.Sd1#
- 1...Sh5
- 2.Qf5#
- 1...Se8
- 2.Qf5#
- 1...Sd7
- 2.Sg6#
- 1...Sh7
- 2.Sg6#
- 1...Qf1!
- threat
- 1.Sc4+?
- Keys
- 1.d8S!
- 1...Sg6+
- 2.Sxg6#
- 1...Qxa1
- 2.Sxc6#
- 1...Rxa1
- 2.Sf7#
- 1...Qg2
- 2.Sa4#
- 1...Qf3
- 2.Sa4#
- 1...Qe4
- 2.Sd3#
- 1...Qd5
- 2.Sc4#
- 1...Qb1
- 2.Sxc6#
- 1...Qc1
- 2.Sxc6#
- 1...Qd1
- 2.Sxc6#
- 1...Qe1
- 2.Sxc6#
- 1...Qf1
- 2.Sxc6#
- 1...Qg1
- 2.Sxc6#
- 1...Ra2
- 2.Sf7#
- 1...Ra3
- 2.Sf7#
- 1...Ra4
- 2.Sf7#
- 1...Ra5
- 2.Sf7#
- 1...Ra6
- 2.Sf7#
- 1...Rb7
- 2.Sd1#
- 1...Rc7
- 2.Sd1#
- 1...Rd7
- 2.Sd1#
- 1...Re7
- 2.Sd1#
- 1...Rf7
- 2.Sd1#
- 2.Sxf7#
- 1...Ra8
- 2.Sf7#
- 1...Bg1
- 2.Sa4#
- 1...Sf5
- 2.Qxf5#
- 1...Sh5
- 2.Qf5#
- 1...Sge6
- 2.Qf5#
- 1...Se8
- 2.Qf5#
- 1...Sfe6
- 2.Sg6#
- 1...Sd7
- 2.Sg6#
- 2.Sf7#
- 1...Sh7
- 2.Sg6#
- 1...g2
- 2.Sxc6#
- 1...Sg6+
- 1.d8S!
FEATURES
- Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 0
- ADDED MATES = 17
- REMOVED MATES = 1
- Sets
- Q(a);N_GUARD::B(A)+S(B)
- Q(a);SBLOCK::B(A)+S(B),DCHECK
- R(h);N_GUARD::B(A)+S(B)
- R(h);N_GUARD,XP(J)::B(A)+S(B)
- B(b);P_PINS(F),S_CUTQ(a)::B(A)+S(B)
- S(i);N_GUARD::QAR1(C),XS(i)
- S(i);N_GUARD::QAR1(C)
- S(j);N_GUARD::S(F)
- S(j);CHECK,N_GUARD::S(F),XS(j)
- S(j);N_GUARD,XP(J)::S(F)
- Tries
- Try
- S(B);CHECK
- Refutation
- K(f);P-FLIGHT
- Try
- S(F);CHECK
- Vars
- Q(a);XS(F)::B(A)+S(B)
- Refutation
- P(e);XS(F)
- Try
- B(D);
- Threat
- B(A)+S(B),DCHECK
- Vars
- S(j);CHECK,N_GUARD::S(F),XS(j)
- S(i);N_GUARD::QAR1(C)
- Refutation
- S(j);
- Try
- B(D);
- Threat
- B(A)+S(B),DCHECK
- Vars
- S(j);CHECK,N_GUARD::S(F),XS(j)
- S(i);N_GUARD::QAR1(C)
- Refutation
- S(j);
- Try
- Q(C);CHECK
- Vars
- Q(a);SBLOCK,XQ(C)::B(A)+S(B),DCHECK
- Refutation
- K(f);P-FLIGHT,XQ(C)
- Try
- Q(C);
- Threat
- B(A)+S(B),DCHECK
- Vars
- S(i);N_GUARD::QAR1(C),XS(i)
- Refutation
- S(j);CHECK,XQ(C)
- Try
- Q(C);CHECK
- Vars
- K(f);P-FLIGHT::QAR1(C)
- Refutation
- P(d);XQ(C)
- Try
- P(J);
- Threat
- QAB1(J)
- Vars
- S(j);CHECK,N_GUARD::S(F),XS(j)
- Q(a);N_GUARD::B(A)+S(B)
- R(h);N_GUARD::B(A)+S(B)
- S(i);N_GUARD::QAR1(C)
- S(j);N_GUARD::S(F)
- Refutation
- Q(a);
- Try
- Actual
- P(J);
- Vars
- S(j);CHECK,N_GUARD::S(F),XS(j)
- Q(a);N_GUARD,XB(A)::S(J),XP(g)
- R(h);N_GUARD,XB(A)::S(J)
- Q(a);N_GUARD::B(A)+S(B)
- Q(a);SBLOCK::B(A)+S(B),DCHECK
- Q(a);N_GUARD::S(J),XP(g)
- R(h);N_GUARD::S(J)
- R(h);N_GUARD::B(A)+S(B)
- B(b);P_PINS(F),S_CUTQ(a)::B(A)+S(B)
- S(i);N_GUARD::QAR1(C),XS(i)
- S(i);N_GUARD::QAR1(C)
- S(j);N_GUARD::S(F)
- P(c);S_CUTQ(a)::S(J),XP(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).