MESON Chess Problem Database

Problem Display
PID: 187762 (3bB3/1N6/1p1Pk1p1/1P3bQP/8/2N2P1n/8/B3K3 w - - 0 1)

Elkhan, Alexander A

Chess Weekly, 1909

3bB3/1N6/1p1Pk1p1/1P3bQP/8/2N2P1n/8/B3K3

#2

10 + 6

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Bc7
      • 2.Qe7#
    • 1...Be7
      • 2.Qxe7#
  • Tries
    • 1.Bf7+?
      • 1...Ke5
        • 2.Sb1#
        • 2.Sd1#
        • 2.Sa2#
        • 2.Se2#
        • 2.Sa4#
        • 2.Se4#
        • 2.Sd5#
      • 1...Kd7
        • 2.Qxd8#
      • 1...Kxf7!
    • 1.Qe3+?
      • 1...Kf6
        • 2.Sb1#
        • 2.Sd1#
        • 2.Sa2#
        • 2.Se2#
        • 2.Sa4#
        • 2.Sd5#
      • 1...Be4!
  • Keys
    • 1.Sd5!
      • 1...Kxd5
        • 2.Bf7#
      • 1...Bxg5
        • 2.Sc7#
      • 1...Sxg5
        • 2.Sf4#
      • 1...gxh5
        • 2.Qg8#
      • 1...Bb1
        • 2.Qe5#
      • 1...Bc2
        • 2.Qe5#
      • 1...Bd3
        • 2.Qe5#
      • 1...Be4
        • 2.Qe5#
      • 1...Bg4
        • 2.Qe5#
      • 1...Bf6
        • 2.Sc7#
      • 1...Bc7
        • 2.Sxc7#
      • 1...Be7
        • 2.Sc7#
      • 1...Sg1
        • 2.Sf4#
      • 1...Sf2
        • 2.Sf4#
      • 1...Sf4
        • 2.Sxf4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 13
    • REMOVED MATES = 0
  • Sets
    • B(f);N_GUARD::QAR1(F)
    • B(f);N_GUARD::QAR1(F),XB(f)
  • Tries
    • Try
      • B(J);CHECK
      • Vars
        • K(d);S_FLIGHT::QAR1(F),XB(f)
      • Refutation
        • K(d);S_FLIGHT,XB(J)
    • Try
      • Q(F);CHECK
      • Refutation
        • B(b);P_SPINB(b)
  • Actual
    • S(C);
    • Vars
      • K(d);P_SPINB(b),S_FLIGHT,XS(C)::B(J)
      • B(f);N_GUARD,XQ(F)::S(C)
      • S(a);N_GUARD,XQ(F)::S(C)
      • P(e);OGATE,XP(G)::QAB(F)
      • B(b);OGATE::QAR1(F)
      • B(f);N_GUARD::S(C)
      • B(f);N_GUARD::S(C),XB(f)
      • S(a);N_GUARD::S(C)
      • S(a);N_GUARD::S(C),XS(a)
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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).