MESON Chess Problem Database

Problem Display
PID: 272752 (2bNn2K/2RPkp1N/2R5/1B1rp3/8/8/8/8 w - - 0 1)

Dutt, Sunder Chunder

The Problemist, 1957

2bNn2K/2RPkp1N/2R5/1B1rp3/8/8/8/8

#2

7 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd8
      • 2.dxc8Q#
      • 2.dxc8R#
  • Tries
    • 1.Re6+?
      • 1...Kxd8
        • 2.Rxc8#
        • 2.dxc8Q#
        • 2.dxc8R#
      • 1...fxe6!
    • 1.dxc8Q+?
      • 1...Rd7
        • 2.Rxd7#
        • 2.Qxd7#
      • 1...Sxc7!
  • Keys
    • 1.Rd6!
      • threat
        • 2.dxc8S#
      • 1...Kxd6
        • 2.dxe8S#
      • 1...Kxd8
        • 2.dxc8Q#
        • 2.dxc8R#
      • 1...Rxd6
        • 2.dxe8Q#
        • 2.dxe8R#
      • 1...Bxd7
        • 2.Rcxd7#
      • 1...Sxd6
        • 2.dxc8Q#
        • 2.dxc8R#
      • 1...Ba6
        • 2.dxe8S#
      • 1...Bb7
        • 2.dxe8S#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(c);S_CUTR(a),S_CUTS(f),S_FLIGHT,XS(F)::PXB(e)=Q
  • Tries
    • Try
      • R(B);CHECK
      • Refutation
        • P(d);XR(B)
    • Try
      • P(D);CHECK,XB(e)
      • Refutation
        • S(f);XR(C)
  • Actual
    • R(B);
    • Threat
      • PXB(e)=S
    • Vars
      • K(c);N_GUARD,S_FLIGHT,XR(B)::PXS(f)=S
      • K(c);N_GUARD,S_FLIGHT,XS(F)::PXB(e)=Q
      • R(a);SBLOCK,XR(B)::PXS(f)=Q
      • B(e);OGATE,P_SPINB(e),XP(D)::R1(C),XB(e)
      • S(f);N_GUARD,SBLOCK,XR(B)::PXB(e)=Q
      • B(e);::PXS(f)=S
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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).