MESON Chess Problem Database

Problem Display
PID: 200693 (1b4B1/p3rq2/7N/8/2p1kNQ1/2B1p3/K2PP3/7b w - - 0 1)

Draper, H Jack

The Problemist, 1983

1b4B1/p3rq2/7N/8/2p1kNQ1/2B1p3/K2PP3/7b

#2

8 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Qd5
      • 2.Bxd5#
    • 1...Qg6
      • 2.Bd5#
    • 1...Qe8
      • 2.Bd5#
      • 2.Qf5#
    • 1...Qxg8
      • 2.Qf5#
    • 1...Qf5
      • 2.Qxf5#
    • 1...Qf6
      • 2.Bd5#
    • 1...Qg7
      • 2.Bd5#
      • 2.Qf5#
    • 1...Qh7
      • 2.Bd5#
    • 1...Qf8
      • 2.Bd5#
    • 1...Bf3
      • 2.Qxf3#
      • 2.exf3#
  • Tries
    • 1.Bh7+?
      • 1...Qg6
        • 2.Bxg6#
      • 1...Qf5
        • 2.Bxf5#
        • 2.Qxf5#
      • 1...Qxh7!
    • 1.Qg2+?
      • 1...Kxf4
        • 2.Qg4#
      • 1...Bxg2!
    • 1.Qg6+?
      • 1...Kxf4
        • 2.Qg4#
      • 1...Qf5
        • 2.Qxf5#
      • 1...Qxg6!
  • Keys
    • 1.Qg1!
      • threat
        • 2.Qxe3#
      • 1...Kxf4
        • 2.Qg4#
      • 1...Qxf4
        • 2.Qb1#
      • 1...Bxf4
        • 2.Qxh1#
      • 1...exd2
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 7
  • Sets
    • Q(g);OGATE::B(H),XQ(g)
    • Q(g);OGATE::B(H)
    • Q(g);N_GUARD,XB(H)::QAB1(F)
    • Q(g);N_GUARD::QAB1(F),XQ(g)
  • Tries
    • Try
      • B(H);CHECK
      • Vars
        • Q(g);N_GUARD,P_SPINQ(g)::B(H),XQ(g)
      • Refutation
        • Q(g);XB(H)
    • Try
      • Q(F);CHECK
      • Vars
        • K(d);OGATEB,P-FLIGHT,XS(E)::QAR1(F)
      • Refutation
        • B(a);XQ(F)
    • Try
      • Q(F);CHECK
      • Vars
        • K(d);OGATEB,P-FLIGHT,XS(E)::QAR1(F)
        • Q(g);N_GUARD,P_SPINQ(g)::QAB1(F),XQ(g)
      • Refutation
        • Q(g);XQ(F)
  • Actual
    • Q(F);
    • Threat
      • QAR1(F),XP(b)
    • Vars
      • K(d);OGATEB,P-FLIGHT,XS(E)::QAR1(F)
      • Q(g);SBLOCK,XS(E)::QAB(F)
      • B(h);SBLOCK,XS(E)::QAB(F),XB(a)
      • P(b);OGATE,XP(B)::QAR1(F)
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).