MESON Chess Problem Database

Problem Display
PID: 187736 (8/p1N5/rn6/r1b2Q1K/3R4/p1kP4/Pp1n1P2/1B2B3 w - - 0 1)

Elkhan, Alexander A

Chess Weekly, 1909

8/p1N5/rn6/r1b2Q1K/3R4/p1kP4/Pp1n1P2/1B2B3

#2

9 + 9

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd4
      • 2.Qf6#
    • 1...Ra4
      • 2.Sb5#
    • 1...Rb5
      • 2.Sxb5#
    • 1...Sa4
      • 2.Rc4#
    • 1...Sc4
      • 2.Rxc4#
    • 1...Sd5
      • 2.Rc4#
    • 1...Sd7
      • 2.Rc4#
    • 1...Sa8
      • 2.Rc4#
    • 1...Sc8
      • 2.Rc4#
  • Tries
    • 1.Sd5+?
      • 1...Sxd5
        • 2.Rc4#
      • 1...Kxd4!
    • 1.Bxd2+?
      • 1...Kxd4
        • 2.Se6#
        • 2.Qe4#
        • 2.Qf4#
        • 2.Qf6#
      • 1...Kxd2!
    • 1.Qxc5+?
      • 1...Sc4
        • 2.Sd5#
        • 2.Rxc4#
      • 1...Rxc5+!
    • 1.Qe5?
      • threat
        • 2.Rc4#
      • 1...Sc4
        • 2.Sd5#
        • 2.Rxc4#
      • 1...Bxd4!
  • Keys
    • 1.Qc8!
      • 1...Bb4+
        • 2.Sb5#
      • 1...Bxd4+
        • 2.Sd5#
      • 1...Bd6+
        • 2.Sb5#
      • 1...Be7+
        • 2.Sb5#
      • 1...Bf8+
        • 2.Sb5#
      • 1...Kxd4
        • 2.Qh8#
      • 1...Sxc8
        • 2.Rc4#
      • 1...Sc4
        • 2.Rxc4#
      • 1...Ra4
        • 2.Sb5#
      • 1...Rb5
        • 2.Sxb5#
      • 1...Sa4
        • 2.Rc4#
      • 1...Sd5
        • 2.Rc4#
      • 1...Sd7
        • 2.Rc4#
      • 1...Sa8
        • 2.Rc4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • K(d);N_SPINS(b),OGATEB,S_FLIGHT,XR(F)::QAB(G)
    • R(e);N_GUARD::S(I)
    • R(e);N_GUARD::S(I),XR(e)
    • S(h);N_GUARD::R1(F)
    • S(h);N_GUARD::R1(F),XS(h)
  • Tries
    • Try
      • S(I);CHECK
      • Vars
        • S(h);XS(I)::R1(F)
      • Refutation
        • K(d);N_SPINS(b),S_FLIGHT,XR(F)
    • Try
      • B(B);CHECK,XS(b)
      • Refutation
        • K(d);S_FLIGHT,XB(B)
    • Try
      • Q(G);CHECK,P_SPINQ(G),XB(f)
      • Refutation
        • R(e);CHECK,XQ(G)
    • Try
      • Q(G);
      • Threat
        • QAB(G)+R(F),DCHECK
      • Refutation
        • B(f);P_PINQ(G),P_SPINB(f),XR(F)
  • Actual
    • Q(G);
    • Vars
      • B(f);CHECK::QAR(G)+S(I),DCHECK
      • B(f);CHECK,SBLOCK,XR(F)::QAR(G)+S(I),DCHECK
      • K(d);N_SPINS(b),OGATEB,S_FLIGHT,XR(F)::QAB(G)
      • S(h);N_GUARD,XQ(G)::R1(F)
      • S(h);N_GUARD::R1(F),XS(h)
      • R(e);N_GUARD::S(I)
      • R(e);N_GUARD::S(I),XR(e)
      • S(h);N_GUARD::R1(F)
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).