MESON Chess Problem Database

Problem Display
PID: 100915 (8/8/8/7p/7P/6NQ/6pp/4K1k1 w - - 0 1)

Elekes, Dezso

Good Companions, 1921

8/8/8/7p/7P/6NQ/6pp/4K1k1

#2

4 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...h1Q
      • 2.Se2#
    • 1...h1S
      • 2.Se2#
    • 1...h1B
      • 2.Se2#
    • 1...h1R
      • 2.Se2#
  • Tries
    • 1.Sh1?
      • 1...gxh1Q
        • 2.Qf1#
      • 1...gxh1S
        • 2.Qf1#
      • 1...gxh1B
        • 2.Qf1#
      • 1...gxh1R
        • 2.Qf1#
        • 2.Qg3#
      • 1...Kxh1!
  • Keys
    • 1.Sf1!
      • threat
        • 2.Qxh2#
      • 1...gxf1Q+
        • 2.Qxf1#
      • 1...gxf1R+
        • 2.Qxf1#
      • 1...Kh1
        • 2.Qxh2#
      • 1...gxf1S
        • 2.Qxf1#
      • 1...gxf1B
        • 2.Qxf1#
      • 1...h1Q
        • 2.Qe3#
      • 1...h1S
        • 2.Qh2#
      • 1...h1B
        • 2.Qh2#
        • 2.Qe3#
      • 1...h1R
        • 2.Qe3#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • P(c);::S(B)
  • Tries
    • Try
      • S(B);
      • Vars
        • P(b);OGATE,SBLOCK,XS(B)::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT,P_SPINP(c),XS(B)
  • Actual
    • S(B);
    • Threat
      • QAB1(C),XP(c)
    • Vars
      • P(b);CHECK,OGATE,XS(B)::QAR1(C),XQ(b)
      • P(b);CHECK,OGATE,XS(B)::QAR1(C),XR(b)
      • K(a);P-FLIGHT,P_SPINP(c)::QAR1(C),XP(c)
      • P(b);OGATE,XS(B)::QAR1(C),XS(b)
      • P(b);OGATE,XS(B)::QAR1(C),XB(b)
      • P(c);SBLOCK::QAB(C)
      • P(c);::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).