MESON Chess Problem Database

Problem Display
PID: 201745 (8/4p3/n1Q3p1/4k3/2n1p3/B3N1K1/8/8 w - - 0 1)

Pech, Jindrich

Svetozor, 1886

8/4p3/n1Q3p1/4k3/2n1p3/B3N1K1/8/8

#2

4 + 6

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sb2
      • 2.Bxb2#
    • 1...Sd2
      • 2.Bb2#
    • 1...Sa5
      • 2.Bb2#
    • 1...Sb6
      • 2.Bb2#
  • Tries
    • 1.Qxe4+?
      • 1...Kf6
        • 2.Qxe7#
      • 1...Kxe4!
    • 1.Qc5+?
      • 1...Ke6
        • 2.Qxe7#
      • 1...Kf6
        • 2.Qxe7#
      • 1...Sxc5!
  • Keys
    • 1.Qd7!
      • threat
        • 2.Sg4#
      • 1...Kf6
        • 2.Qxe7#
      • 1...Sxe3
        • 2.Bb2#
      • 1...Sd6
        • 2.Bb2#
      • 1...e6
        • 2.Qg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • S(a);N_GUARD::B(A),XS(a)
    • S(a);N_GUARD::B(A)
  • Tries
    • Try
      • Q(D);CHECK,XP(b)
      • Vars
        • K(c);OGATE,S_FLIGHT::QAB1(D),XP(f)
      • Refutation
        • K(c);P-FLIGHT,XQ(D)
    • Try
      • Q(D);CHECK
      • Vars
        • K(c);P-FLIGHT::QAR1(D),XP(f)
        • K(c);S_FLIGHT::QAB1(D),XP(f)
      • Refutation
        • S(d);XQ(D)
  • Actual
    • Q(D);
    • Threat
      • S(B)
    • Vars
      • K(c);S_FLIGHT::QAB1(D),XP(f)
      • S(a);N_GUARD,XS(B)::B(A)
      • S(a);N_GUARD::B(A)
      • P(f);OGATE,SBLOCK::QAB(D)
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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).