MESON Chess Problem Database

Problem Display
PID: 234828 (4Q1n1/2p1q3/8/K7/1p6/2P1k1N1/8/3RnR2 w - - 0 1)

Dolginovich, Nikolai Osipovich

Source?, 0000

4Q1n1/2p1q3/8/K7/1p6/2P1k1N1/8/3RnR2

#2

6 + 6

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qe4
      • 2.Qxe4#
    • 1...Qe5+
      • 2.Qxe5#
    • 1...Qe6
      • 2.Qxe6#
    • 1...Sh6
      • 2.Qxe7#
  • Tries
    • 1.Qb5?
      • threat
        • 2.Qe2#
      • 1...Qc5
        • 2.Qxc5#
      • 1...Qg5
        • 2.Qxg5#
      • 1...Qe5
        • 2.Qxe5#
      • 1...Sd3
        • 2.Rxd3#
        • 2.Qxd3#
      • 1...Sf3!
  • Keys
    • 1.Qh5!
      • threat
        • 2.Qe2#
      • 1...Qc5+
        • 2.Qxc5#
      • 1...Qg5+
        • 2.Qxg5#
      • 1...Qe5+
        • 2.Qxe5#
      • 1...Sf3
        • 2.Rxf3#
        • 2.Qxf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • Q(e);OGATE::QAR1(F),XQ(e)
    • Q(e);CHECK,OGATE::QAR2(F),XQ(e)
    • Q(e);OGATE::QAR(F),XQ(e)
    • S(f);N_GUARD::QAR(F),XQ(e)
  • Tries
    • Try
      • Q(F);N_PINQ(e)
      • Threat
        • QAR1(F)
      • Vars
        • Q(e);N_GUARD,P_PINQ(F)::QAB(F),XQ(e)
        • Q(e);N_GUARD,P_PINQ(F)::QAR2(F),XQ(e)
      • Refutation
        • S(a);
  • Actual
    • Q(F);N_PINQ(e)
    • Threat
      • QAR1(F)
    • Vars
      • Q(e);CHECK,N_GUARD::QAB(F),XQ(e)
      • Q(e);CHECK,N_GUARD::QAR2(F),XQ(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).