MESON Chess Problem Database

Problem Display
PID: 183212 (5qnQ/4pkp1/p3N3/p3R1RN/p1B5/K7/8/8 w - - 0 1)

Godfrey, Frederick Earle

Philadelphia Inquirer, 1907

5qnQ/4pkp1/p3N3/p3R1RN/p1B5/K7/8/8

#2

7 + 8

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qe8
      • 2.Rxg7#
      • 2.Qxg7#
    • 1...Sf6
      • 2.Qxf8#
    • 1...Sh6
      • 2.Qxf8#
  • Tries
    • 1.Bd3?
      • threat
        • 2.Bg6#
      • 1...g6
        • 2.Bxg6#
      • 1...Ke8!
    • 1.Ref5+?
      • 1...Sf6
        • 2.Qxf8#
      • 1...Ke8!
  • Keys
    • 1.Sf6!
      • 1...exf6+
        • 2.Sc5#
      • 1...Kxf6
        • 2.Ref5#
      • 1...Sxf6
        • 2.Qxf8#
      • 1...gxf6
        • 2.Qh5#
      • 1...Qa8
        • 2.Qxg7#
      • 1...Qb8
        • 2.Qxg7#
      • 1...Qc8
        • 2.Qxg7#
      • 1...Qd8
        • 2.Qxg7#
      • 1...Qe8
        • 2.Qxg7#
      • 1...Sh6
        • 2.Qxf8#
      • 1...g6
        • 2.Sd8#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 0
  • Sets
    • S(h);OGATE::QAR1(G),XQ(g)
  • Tries
    • Try
      • B(B);
      • Threat
        • B(B)
      • Vars
        • P(f);::B(B),XP(f)
      • Refutation
        • K(e);S_FLIGHT
    • Try
      • R(C);CHECK
      • Vars
        • S(h);OGATE,P_SPINS(h)::QAR1(G),XQ(g)
      • Refutation
        • K(e);S_FLIGHT
  • Actual
    • S(E);
    • Vars
      • P(d);CHECK,N_GUARD,SBLOCK,XS(E)::B(B)+S(F)
      • K(e);OGATEB,P-FLIGHT,P_SPINP(f),XS(E)::R1(C)
      • S(h);OGATE,SBLOCK,XS(E)::QAR1(G),XQ(g)
      • P(f);N_GUARD,SBLOCK,XS(E)::QAB(G)
      • Q(g);N_GUARD::QAR1(G),XP(f)
      • S(h);OGATE::QAR1(G),XQ(g)
      • P(f);::B(B)+S(F),DCHECK
HTML5 logo

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).