MESON Chess Problem Database

Problem Display
PID: 88338 (3Nr3/2Npk1p1/3p4/Q1R1PB2/8/B1n5/8/4KR2 w - - 0 1)

van Dijk, Nils Gustav Gerard

The Problemist, 1967

3Nr3/2Npk1p1/3p4/Q1R1PB2/8/B1n5/8/4KR2

#2

9 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd8
      • 2.Sd5#
  • Tries
    • 1.Sd5+?
      • 1...Kf8
        • 2.Be6#
        • 2.Bh7#
      • 1...Sxd5!
    • 1.Sc6+?
      • 1...Kf7
        • 2.Bh7#
      • 1...Kf8
        • 2.Be6#
        • 2.Bh7#
      • 1...dxc6!
  • Keys
    • 1.exd6+!
      • 1...Kxd6+
        • 2.Re5#
      • 1...Kf6+
        • 2.Be4#
      • 1...Kxd8+
        • 2.Se6#
      • 1...Kf8+
        • 2.Be6#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(d);P_PINP(F),S_FLIGHT,XS(I)::QAB(D)+S(H)
  • Tries
    • Try
      • S(H);CHECK
      • Refutation
        • S(a);XS(H)
    • Try
      • S(I);CHECK
      • Vars
        • K(d);P-FLIGHT,P_PINP(F)::R(B)+B(G)
      • Refutation
        • P(c);XS(I)
  • Actual
    • P(F);CHECK,XP(b)
    • Vars
      • K(d);CHECK,S_FLIGHT,XP(F)::B(C)+R(E)
      • K(d);CHECK,S_FLIGHT::R(B)+B(G)
      • K(d);CHECK,S_FLIGHT,XS(I)::QAB(D)+S(H),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).