MESON Chess Problem Database

Problem Display
PID: 139817 (1Q3K2/4p1R1/2b5/R6p/5N1k/2n1pqn1/8/6N1 w - - 0 1)

Westbury, Eric Ernest

The Problemist, 1937

1Q3K2/4p1R1/2b5/R6p/5N1k/2n1pqn1/8/6N1

#2

6 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Qxf4+
      • 2.Qxf4#
    • 1...Ba4
      • 2.Sxf3#
    • 1...Bb5
      • 2.Sxf3#
    • 1...Bd7
      • 2.Sxf3#
    • 1...Be8
      • 2.Sxf3#
    • 1...Sce4
      • 2.Sxf3#
    • 1...Sd5
      • 2.Sxf3#
    • 1...Sge4
      • 2.Sxf3#
    • 1...e5
      • 2.Qd8#
    • 1...e6
      • 2.Qd8#
  • Keys
    • 1.Qb4!
      • threat
        • 2.Qxe7#
      • 1...Qxf4+
        • 2.Qxf4#
      • 1...Qe4
        • 2.Sg2#
      • 1...Qg4
        • 2.Sg6#
      • 1...Qd5
        • 2.Sg2#
      • 1...Sce4
        • 2.Sxf3#
      • 1...Sd5
        • 2.Sxf3#
      • 1...Sge4
        • 2.Sxf3#
      • 1...Sf5
        • 2.Sg2#
      • 1...e5
        • 2.Qe7#
      • 1...e6
        • 2.Qe7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • Q(c);CHECK,OGATE,XS(B)::QAR2(E),XQ(c)
    • B(g);N_GUARD::S(A),XQ(c)
    • S(a);S_CUTB(g)::S(A),XQ(c)
    • S(d);S_CUTB(g)::S(A),XQ(c)
    • P(h);OGATEB::QAB(E)
  • Actual
    • Q(E);
    • Threat
      • QAB(E),XP(h)
    • Vars
      • Q(c);CHECK,OGATE,P_SPINQ(c),XS(B)::QAR2(E),XQ(c)
      • Q(c);N_PINS(B)::S(B)
      • Q(c);N_PINS(B)::QAR(E)+S(B),DCHECK
      • S(a);S_CUTB(g)::S(A),XQ(c)
      • S(d);S_CUTB(g)::S(A),XQ(c)
      • S(d);N_PINS(B)::QAR(E)+S(B),DCHECK
      • P(h);::QAB(E)
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).