MESON Chess Problem Database

Problem Display
PID: 234996 (8/8/8/5Pq1/4Q3/6Pk/3P1B2/7K w - - 0 1)

Akimov, Nikolai Nikolaevich

64 Shakhmatnoe obozrenie, 2018

8/8/8/5Pq1/4Q3/6Pk/3P1B2/7K

#2

6 + 2

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd2
      • 2.Qh4#
    • 1...Qe3
      • 2.Qh4#
    • 1...Qh4
      • 2.Qxh4#
    • 1...Qg4
      • 2.Qg2#
    • 1...Qxf5
      • 2.Qxf5#
      • 2.Qh4#
    • 1...Qg6
      • 2.Qh4#
    • 1...Qg7
      • 2.Qh4#
    • 1...Qg8
      • 2.Qh4#
  • Tries
    • 1.g4?
      • threat
        • 2.Qg2#
        • 2.Qf3#
      • 1...Qxf5
        • 2.Qg2#
      • 1...Qf4
        • 2.Qg2#
      • 1...Qe3
        • 2.Qg2#
      • 1...Qh4
        • 2.Qg2#
      • 1...Qxg4!
  • Keys
    • 1.Qf3!
      • threat
        • 2.g4#
      • 1...Qxg3
        • 2.Qxg3#
      • 1...Qxf5
        • 2.Qxf5#
      • 1...Qe3
        • 2.Qh5#
      • 1...Qf4
        • 2.gxf4#
      • 1...Qh4
        • 2.gxh4#
      • 1...Qg4
        • 2.Qg2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • Q(b);N_GUARD,XP(B)::QAR1(E)
    • Q(b);N_GUARD::QAR1(E)
    • Q(b);N_GUARD::QAR1(E),XQ(b)
    • Q(b);SBLOCK::QAB1(E)
  • Tries
    • Try
      • P(D);
      • Threat
        • DUALS(2)
      • Vars
        • Q(b);XP(F)::QAB1(E)
        • Q(b);::QAB1(E)
      • Refutation
        • Q(b);XP(D)
  • Actual
    • Q(E);
    • Threat
      • QAR(E)+P(D)
    • Vars
      • Q(b);OGATE,P_SPINQ(b),XP(D)::QAR1(E),XQ(b)
      • Q(b);OGATE,XP(F)::QAB(E),XQ(b)
      • Q(b);N_GUARD::QAR2(E)
      • Q(b);OGATE::QAR(E)+P(D),XQ(b)
      • Q(b);SBLOCK::QAB1(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).