MESON Chess Problem Database

Problem Display
PID: 154414 (3nR3/3k4/P5P1/2R5/K3p3/1Q2P3/8/8 w - - 0 1)

McWilliam, Robert C

County Down Spectator, 1987

3nR3/3k4/P5P1/2R5/K3p3/1Q2P3/8/8

#2

7 + 3

15393 McWilliam Scrapbook 2015
5454 Near Snap 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Kd6
      • 2.Qd5#
    • 1...Se6
      • 2.Qxe6#
    • 1...Sb7
      • 2.Qe6#
    • 1...Sf7
      • 2.Qe6#
  • Tries
    • 1.Qf7+?
      • 1...Kd6
        • 2.Qd5#
        • 2.Qc7#
        • 2.Qe7#
      • 1...Sxf7!
    • 1.Qb5+?
      • 1...Sc6
        • 2.Qxc6#
      • 1...Kd6!
    • 1.Qb6?
      • threat
        • 2.Qxd8#
      • 1...Sc6
        • 2.Qxc6#
      • 1...Se6
        • 2.Qc6#
        • 2.Qxe6#
      • 1...Sb7
        • 2.Qc6#
        • 2.Qe6#
      • 1...Sf7
        • 2.Qc6#
        • 2.Qe6#
      • 1...Kxe8!
  • Keys
    • 1.Rc8!
      • 1...Kd6
        • 2.Qd1#
      • 1...Kxc8
        • 2.Qb7#
      • 1...Kxe8
        • 2.Qf7#
      • 1...Sc6
        • 2.Qd5#
        • 2.Qe6#
      • 1...Se6
        • 2.Qd5#
        • 2.Qxe6#
      • 1...Sb7
        • 2.Qe6#
      • 1...Sf7
        • 2.Qe6#

Anticipated by 187856(1910)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • K(b);P-FLIGHT::QAR1(A)
    • S(c);N_GUARD::QAB1(A),XS(c)
    • S(c);N_GUARD::QAB1(A)
  • Tries
    • Try
      • Q(A);CHECK
      • Refutation
        • S(c);XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • S(c);N_GUARD,P_SPINS(c)::QAB1(A),XS(c)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(A);
      • Threat
        • QAR1(A),XS(c)
      • Vars
        • S(c);N_GUARD::QAB1(A),XS(c)
      • Refutation
        • K(b);S_FLIGHT,XR(G)
  • Actual
    • R(D);
    • Vars
      • K(b);P-FLIGHT::QAR(A)
      • K(b);P_SPINS(c),S_FLIGHT,XR(D)::QAB1(A)
      • K(b);P_SPINS(c),S_FLIGHT,XR(G)::QAB1(A)
      • S(c);N_GUARD::QAB1(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).