MESON Chess Problem Database

Problem Display
PID: 77906 (RB4rk/2Q4b/6p1/5p2/2B5/8/8/1K6 w - - 0 1)

Zalkind, Lazar Borissovich

Shakhmatny Vestnik, 1913

RB4rk/2Q4b/6p1/5p2/2B5/8/8/1K6

#2

5 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Rc8
      • 2.Qe5#
    • 1...Rd8
      • 2.Qe5#
  • Tries
    • 1.Bxg8?
      • threat
        • 2.Qxh7#
      • 1...Kxg8
        • 2.Ba7#
      • 1...Bxg8!
    • 1.Ra7?
      • threat
        • 2.Qxh7#
      • 1...Rg7
        • 2.Qxg7#
      • 1...Rxb8+!
    • 1.Qb7?
      • threat
        • 2.Be5#
      • 1...Rxb8
        • 2.Qb2#
      • 1...Rg7!
  • Keys
    • 1.Qh2!
      • threat
        • 2.Be5#
      • 1...Rxb8+
        • 2.Qb2#
      • 1...Kg7
        • 2.Be5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • R(d);N_GUARD::QAB(C)
  • Tries
    • Try
      • B(B);XR(d)
      • Threat
        • QAR1(C),XB(c)
      • Vars
        • K(e);OGATEB,P-FLIGHT,XB(B)::R(D)+B(E)
      • Refutation
        • B(c);XB(B)
    • Try
      • R(D);
      • Threat
        • QAR1(C),XB(c)
      • Vars
        • R(d);N_GUARD::QAB1(C),XR(d)
      • Refutation
        • R(d);CHECK,XB(E)
    • Try
      • Q(C);
      • Threat
        • B(E)
      • Vars
        • R(d);N_GUARD,P_PINQ(C),P_SPINR(d),XB(E)::QAB(C)
      • Refutation
        • R(d);
  • Actual
    • Q(C);P_PINB(c)
    • Threat
      • B(E)
    • Vars
      • R(d);CHECK,N_GUARD,P_SPINR(d),XB(E)::QAB(C)
      • K(e);N_SPINB(c),S_FLIGHT::B(E)
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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).