MESON Chess Problem Database

Problem Display
PID: 206428 (3Q4/3p3b/3k2n1/R5N1/1r1n4/2N5/8/6BK w - - 0 1)

Mackay, Donald

Shakhmaty, 1925

3Q4/3p3b/3k2n1/R5N1/1r1n4/2N5/8/6BK

#2

6 + 6

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sc6
      • 2.Rd5#
  • Tries
    • 1.Sge4+?
      • 1...Ke6
        • 2.Qf6#
      • 1...Kc6!
  • Keys
    • 1.Rc5!
      • threat
        • 2.Sce4#
      • 1...Kxc5
        • 2.Qc7#
      • 1...Sc2
        • 2.Qf6#
      • 1...Se2
        • 2.Qf6#
      • 1...Sb3
        • 2.Qf6#
      • 1...Sf3
        • 2.Qf6#
      • 1...Sb5
        • 2.Qf6#
      • 1...Sf5
        • 2.Qf6#
      • 1...Sc6
        • 2.Rd5#
      • 1...Se6
        • 2.Sf7#
      • 1...Sf4
        • 2.Qf8#
      • 1...Sh4
        • 2.Qf8#
      • 1...Se5
        • 2.Qf8#
      • 1...Se7
        • 2.Qc7#
      • 1...Sf8
        • 2.Qxf8#
      • 1...Sh8
        • 2.Qf8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 14
    • REMOVED MATES = 0
  • Sets
    • S(b);SBLOCK::R1(D)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • K(c);N_SPINP(e),P-FLIGHT::QAR1(F)
      • Refutation
        • K(c);N_SPINP(e),P-FLIGHT
  • Actual
    • R(D);
    • Threat
      • S(C)
    • Vars
      • K(c);N_SPINP(e),P_SPINS(b),S_FLIGHT,XR(D)::QAR2(F)
      • S(b);N_GUARD::QAR2(F)
      • S(b);SBLOCK::R1(D)
      • S(b);SBLOCK::S(E)
      • S(d);N_GUARD::QAB(F)
      • S(d);SBLOCK::QAB1(F)
      • S(d);N_GUARD::QAB(F),XS(d)
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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).