MESON Chess Problem Database

Problem Display
PID: 173602 (8/8/8/8/7p/7Q/7P/4nK1k w - - 0 1)

Boros, Sandor

Magyar Sakkvilag, 1929

8/8/8/8/7p/7Q/7P/4nK1k

#2

3 + 3

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sc2
      • 2.Qg2#
    • 1...Sg2
      • 2.Qxg2#
    • 1...Sd3
      • 2.Qg2#
    • 1...Sf3
      • 2.Qg2#
  • Tries
    • 1.Kf2?
      • 1...Sc2
        • 2.Qg2#
      • 1...Sg2
        • 2.Qxg2#
      • 1...Sf3
        • 2.Qg2#
      • 1...Sd3+!
    • 1.Qg3?
      • threat
        • 2.Qg1#
      • 1...Sg2
        • 2.Qxg2#
      • 1...Sf3
        • 2.Qg2#
      • 1...hxg3!
  • Keys
    • 1.Qg4!
      • threat
        • 2.Qg1#
      • 1...Kxh2
        • 2.Qxh4#
      • 1...Sg2
        • 2.Qxg2#
      • 1...Sf3
        • 2.Qg2#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • S(a);N_GUARD::QAB1(C)
    • S(a);N_GUARD::QAB1(C),XS(a)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Vars
        • S(a);N_GUARD::QAB1(C)
        • S(a);N_GUARD::QAB1(C),XS(a)
      • Refutation
        • S(a);CHECK
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Vars
        • S(a);N_GUARD::QAB1(C),XS(a)
        • S(a);N_GUARD::QAB1(C)
      • Refutation
        • P(c);XQ(C)
  • Actual
    • Q(C);
    • Threat
      • QAR1(C)
    • Vars
      • K(b);OGATEB,P-FLIGHT,XP(B)::QAR2(C),XP(c)
      • S(a);N_GUARD::QAB1(C),XS(a)
      • S(a);N_GUARD::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).