MESON Chess Problem Database

Problem Display
PID: 263078 (4Q3/8/5p2/3R4/1p3k2/8/5K2/5n2 w - - 0 1)

Nagovitsin, Eduard Nikolaevich

HM., SuperProblem, 2020

4Q3/8/5p2/3R4/1p3k2/8/5K2/5n2

#2

3 + 4

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...b3
      • 2.Qa4#
  • Tries
    • 1.Rf5+?
      • 1...Kg4
        • 2.Qh5#
      • 1...Kxf5!
  • Keys
    • 1.Qh5!
      • threat
        • 2.Rd4#
        • 2.Qf3#
        • 2.Qh4#
        • 2.Qf5#
      • 1...Ke4
        • 2.Qf3#
        • 2.Qf5#
      • 1...Sd2
        • 2.Qh4#
        • 2.Qf5#
      • 1...Sh2
        • 2.Rd4#
        • 2.Qf5#
      • 1...Se3
        • 2.Rd4#
        • 2.Qf3#
      • 1...Sg3
        • 2.Qf3#
        • 2.Qh4#
      • 1...f5
        • 2.Qh4#
        • 2.Qxf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • P(b);OGATEB::QAR(C)
  • Tries
    • Try
      • R(B);CHECK
      • Vars
        • K(c);N_GUARD,P-FLIGHT::QAB1(C)
      • Refutation
        • K(c);P-FLIGHT,XR(B)
  • Actual
    • Q(C);
    • Threat
      • DUALS(4)
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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).