MESON Chess Problem Database

Problem Display
PID: 204351 (6Rn/6qp/4Qpkp/4p2p/4K2P/8/8/8 w - - 0 1)

Hultberg, Gustav Herbert

Schackvarlden, 1925

6Rn/6qp/4Qpkp/4p2p/4K2P/8/8/8

#2

4 + 8

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxg8
      • 2.Qxg8#
    • 1...Sf7
      • 2.Qf5#
  • Tries
    • 1.Qd7?
      • threat
        • 2.Rxg7#
        • 2.Qxg7#
      • 1...f5+
        • 2.Qxf5#
      • 1...Sf7
        • 2.Qf5#
      • 1...Qxg8!
  • Keys
    • 1.Qc8!
      • 1...f5+
        • 2.Qxf5#
      • 1...Kf7
        • 2.Qe8#
      • 1...Qxg8
        • 2.Qxg8#
      • 1...Sf7
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(f);N_SPINQ(f),OGATE,XR(D)::QAR2(C),XQ(f)
    • S(h);SBLOCK::QAB1(C)
  • Tries
    • Try
      • Q(C);N_PINP(c)
      • Threat
        • DUALS(2)
      • Vars
        • P(c);CHECK::QAB1(C),XP(c)
        • S(h);SBLOCK::QAB1(C)
      • Refutation
        • Q(f);N_SPINQ(f),XR(D)
  • Actual
    • Q(C);N_PINP(c)
    • Vars
      • P(c);CHECK::QAB1(C),XP(c)
      • K(d);N_SPINQ(f),S_FLIGHT::QAB1(C)
      • Q(f);N_SPINQ(f),OGATE,XR(D)::QAR2(C),XQ(f)
      • S(h);SBLOCK::QAB1(C)
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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).