MESON Chess Problem Database

Problem Display
PID: 214724 (n2NN3/6q1/3B4/2PkPQp1/3p1bp1/1K4P1/8/8 w - - 0 1)

Anonymous

Detroit Free Press (Centennial Ty.), 1877

n2NN3/6q1/3B4/2PkPQp1/3p1bp1/1K4P1/8/8

#2

8 + 7

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe5
      • 2.Sf6#
    • 1...Qf6
      • 2.Sxf6#
    • 1...Qa7
      • 2.Sf6#
    • 1...Qc7
      • 2.Sf6#
    • 1...Qd7
      • 2.Sf6#
    • 1...Qh7
      • 2.Sf6#
    • 1...Qg8
      • 2.Sf6#
    • 1...d3
      • 2.Qxd3#
  • Tries
    • 1.e6+?
      • 1...Qe5
        • 2.Sf6#
      • 1...Be5!
  • Keys
    • 1.Qh7!
      • threat
        • 2.Qh1#
      • 1...Qb7+
        • 2.Qxb7#
      • 1...Qxe5
        • 2.Qb7#
      • 1...Qxh7
        • 2.Sf6#
      • 1...Qg6
        • 2.Qb7#
      • 1...d3
        • 2.Qxd3#
      • 1...Qh6
        • 2.Qb7#
      • 1...Qh8
        • 2.Qb7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • Q(f);N_GUARD,P_SPINQ(f),XP(D)::S(H)
    • Q(f);N_GUARD::S(H),XQ(f)
    • Q(f);N_GUARD::S(H)
    • P(a);OGATEB::QAR2(E),XP(a)
  • Tries
    • Try
      • P(D);CHECK
      • Vars
        • Q(f);P_SPINQ(f)::S(H)
      • Refutation
        • B(b);P_SPINB(b)
  • Actual
    • Q(E);
    • Threat
      • QAB(E)
    • Vars
      • Q(f);CHECK,OGATE::QAB(E),XQ(f)
      • Q(f);OGATE,XP(D)::QAB(E)
      • Q(f);N_GUARD,XQ(E)::S(H)
      • Q(f);OGATE::QAB(E)
      • P(a);OGATEB::QAR2(E),XP(a)
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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).