MESON Chess Problem Database

Problem Display
PID: 187644 (7q/1P1kNP1p/P3N2P/2B1p3/1n2K3/1Q6/8/8 w - - 0 1)

Elkhan, Alexander A

Revue d'Echecs, 1909

7q/1P1kNP1p/P3N2P/2B1p3/1n2K3/1Q6/8/8

#2

9 + 5

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qf6
      • 2.b8S#
    • 1...Qg7
      • 2.b8S#
    • 1...Qc8
      • 2.bxc8Q#
      • 2.bxc8B#
    • 1...Sa2
      • 2.Qd5#
    • 1...Sc2
      • 2.Qd5#
    • 1...Sd3
      • 2.Qd5#
    • 1...Sd5
      • 2.Qxd5#
    • 1...Sxa6
      • 2.Qd5#
    • 1...Sc6
      • 2.Qd5#
  • Tries
    • 1.Qa4+?
      • 1...Sc6
        • 2.Qxc6#
      • 1...Kxe6!
    • 1.b8Q?
      • threat
        • 2.Qd6#
        • 2.Qa7#
        • 2.Qc7#
        • 2.Qb7#
      • 1...Sxa6
        • 2.Qd5#
        • 2.Qd6#
        • 2.Q8b5#
      • 1...Sd5
        • 2.Qxd5#
        • 2.Qd6#
      • 1...Qc8
        • 2.Qd6#
        • 2.Qxc8#
      • 1...Qd8
        • 2.Qd6#
        • 2.Qxd8#
      • 1...Sc6
        • 2.Qd5#
        • 2.Qd6#
        • 2.Qc7#
        • 2.Q8b7#
      • 1...Qxb8!
    • 1.f8Q?
      • threat
        • 2.b8S#
      • 1...Sxa6
        • 2.Qd5#
      • 1...Sd5
        • 2.Qxd5#
      • 1...Sc6
        • 2.Qd5#
      • 1...Qxf8!
    • 1.f8R?
      • threat
        • 2.b8S#
      • 1...Sxa6
        • 2.Qd5#
      • 1...Sd5
        • 2.Qxd5#
      • 1...Sc6
        • 2.Qd5#
      • 1...Qxf8!
  • Keys
    • 1.Sc6!
      • 1...Kxc6
        • 2.Qa4#
      • 1...Sxa6
        • 2.Qd5#
      • 1...Sxc6
        • 2.Qd5#
      • 1...Sd5
        • 2.Qxd5#
      • 1...Qa8
        • 2.Sxe5#
      • 1...Qf6
        • 2.Sb8#
      • 1...Qg7
        • 2.Sb8#
      • 1...Qb8
        • 2.Sxb8#
      • 1...Qc8
        • 2.Sxe5#
      • 1...Qd8
        • 2.Sxe5#
      • 1...Qe8
        • 2.Sxe5#
      • 1...Qf8
        • 2.Sxe5#
      • 1...Qg8
        • 2.Sxe5#
      • 1...Sa2
        • 2.Qd5#
      • 1...Sc2
        • 2.Qd5#
      • 1...Sd3
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • Q(e);N_GUARD::P=S
    • Q(e);OGATE::PXQ(e)=Q
    • S(a);N_GUARD::QAR2(A)
    • S(a);N_GUARD::QAR2(A),XS(a)
    • S(a);N_GUARD,XP(D)::QAR2(A)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB1(A),XS(a)
      • Refutation
        • K(c);S_FLIGHT,XS(E)
    • Try
      • P(G);
      • Threat
        • DUALS(4)
      • Refutation
        • Q(e);XQ(G)
    • Try
      • P(I);
      • Threat
        • P=S
      • Vars
        • S(a);N_GUARD,XP(D)::QAR2(A)
        • S(a);N_GUARD::QAR2(A),XS(a)
        • S(a);N_GUARD::QAR2(A)
      • Refutation
        • Q(e);XQ(I)
    • Try
      • P(I);
      • Threat
        • P=S
      • Vars
        • S(a);N_GUARD,XP(D)::QAR2(A)
        • S(a);N_GUARD::QAR2(A),XS(a)
        • S(a);N_GUARD::QAR2(A)
      • Refutation
        • Q(e);XR(I)
  • Actual
    • S(H);
    • Vars
      • K(c);OGATEB,S_FLIGHT,XS(H)::QAB(A)
      • S(a);N_GUARD,XP(D)::QAR2(A)
      • S(a);N_GUARD,XS(H)::QAR2(A)
      • S(a);N_GUARD::QAR2(A),XS(a)
      • Q(e);N_GUARD::S(H),XP(b)
      • Q(e);N_GUARD::S(H)
      • Q(e);N_GUARD::S(H),XQ(e)
      • S(a);N_GUARD::QAR2(A)
HTML5 logo

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).