MESON Chess Problem Database

Problem Display
PID: 83523 (8/1p6/1B6/R3NppQ/4k1qR/1p1p2b1/6P1/1b3K2 w - - 0 1)

Ellerman, Arnoldo

Good Companions, 1919

8/1p6/1B6/R3NppQ/4k1qR/1p1p2b1/6P1/1b3K2

#2

7 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qf4+
      • 2.Qf3#
    • 1...Qxh4
      • 2.Qf3#
  • Keys
    • 1.Qe8!
      • threat
        • 2.Qa4#
      • 1...Qf4+
        • 2.Sf3#
      • 1...Kf4
        • 2.Sg6#
        • 2.Ra4#
        • 2.Qa4#
      • 1...Bxe5
        • 2.Qxe5#
      • 1...Be1
        • 2.Sg6#
      • 1...Bf2
        • 2.Sg6#
      • 1...f4
        • 2.Sxg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • Q(f);CHECK,OGATE::QAB1(F)
    • Q(f);N_SPINQ(f),OGATE,XR(C)::QAB1(F)
  • Actual
    • Q(F);
    • Threat
      • QAR(F)
    • Vars
      • Q(f);CHECK,S_CUTB(d)::QAR(F)+S(E)
      • B(d);OGATE,P_SPINB(d),XS(E)::QAR1(F),XB(d)
      • B(d);N_GUARD::QAR(F)+S(E)
      • P(g);N_SPINQ(f),SBLOCK,S_CUTB(d)::QAR(F)+S(E),XQ(f)
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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).