MESON Chess Problem Database

Problem Display
PID: 186052 (r3k2r/8/2P1K1P1/1Q6/8/8/8/8 w kq - 0 1)

Ouellet, Charles

Problem Observer, 2017

r3k2r/8/2P1K1P1/1Q6/8/8/8/8

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Qb8#
    • 1...Ra2
      • 2.Qb8#
    • 1...Ra3
      • 2.Qb8#
    • 1...Ra4
      • 2.Qb8#
    • 1...Ra5
      • 2.Qb8#
    • 1...Ra6
      • 2.Qb8#
    • 1...Ra7
      • 2.Qb8#
    • 1...Rb8
      • 2.Qxb8#
    • 1...Rf8
      • 2.c7#
    • 1...0-0-0
      • 2.Qb7#
  • Keys
    • 1.Qb7!
      • threat
        • 2.Qxa8#
        • 2.Qe7#
      • 1...Kd8
        • 2.Qd7#
      • 1...Kf8
        • 2.Qf7#
      • 1...0-0
        • 2.Qh7#
      • 1...Ra1
        • 2.Qc8#
        • 2.Qe7#
        • 2.Qb8#
      • 1...Ra2
        • 2.Qc8#
        • 2.Qe7#
        • 2.Qb8#
      • 1...Ra3
        • 2.Qc8#
        • 2.Qe7#
        • 2.Qb8#
      • 1...Ra4
        • 2.Qc8#
        • 2.Qe7#
        • 2.Qb8#
      • 1...Ra5
        • 2.Qc8#
        • 2.Qe7#
        • 2.Qb8#
      • 1...Ra6
        • 2.Qc8#
        • 2.Qe7#
        • 2.Qb8#
      • 1...Ra7
        • 2.Qc8#
        • 2.Qb8#
      • 1...Rb8
        • 2.Qe7#
        • 2.Qxb8#
      • 1...Rc8
        • 2.Qxc8#
        • 2.Qe7#
      • 1...Rd8
        • 2.Qe7#
        • 2.Qf7#
      • 1...Rh7
        • 2.Qxa8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 10
  • Sets
    • R(a);N_GUARD::QAR(A)
    • R(a);N_GUARD,P_PINP(B)::QAR(A)
    • R(a);N_GUARD::QAR(A),XR(a)
    • R(c);SBLOCK::QAB(A)+P(B)
    • K(b);0-0-0,OGATEB::QAB1(A)
  • Actual
    • Q(A);
    • Threat
      • DUALS(2)
    • Vars
      • K(b);P-FLIGHT::QAR1(A)
      • K(b);0-0,OGATEB::QAB1(A)
      • R(c);::QAR(A),XR(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).