MESON Chess Problem Database

Problem Display
PID: 134520 (r5R1/1pPbk1B1/1r4R1/1p2Np2/8/8/3pQ2K/3n4 w - - 0 1)

Brotherton, David WA

The Field, 1965

(First published on Thu Jul 1 1965)

r5R1/1pPbk1B1/1r4R1/1p2Np2/8/8/3pQ2K/3n4

#2

7 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rd8
      • 2.cxd8Q#
      • 2.cxd8B#
    • 1...Be8
      • 2.Bf8#
  • Tries
    • 1.Bf8+?
      • 1...Ke8
        • 2.Ba3#
        • 2.Bb4#
        • 2.Bc5#
        • 2.Bd6#
      • 1...Rxf8!
    • 1.Qxd2?
      • threat
        • 2.Qxd7#
      • 1...Rd6
        • 2.Qxd6#
      • 1...Rd8
        • 2.cxd8Q#
        • 2.cxd8B#
      • 1...Bc6
        • 2.Qb4#
        • 2.Qg5#
        • 2.Qd6#
      • 1...Be6
        • 2.Bf6#
      • 1...Bc8
        • 2.Qd8#
      • 1...Be8
        • 2.Bf8#
      • 1...Ra2!
  • Keys
    • 1.Qd3!
      • threat
        • 2.Qxd7#
      • 1...Rd6
        • 2.Qxd6#
      • 1...Rd8
        • 2.cxd8Q#
        • 2.cxd8B#
      • 1...Bc6
        • 2.Qd6#
      • 1...Be6
        • 2.Bf6#
      • 1...Bc8
        • 2.Qd8#
      • 1...Be8
        • 2.Bf8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • R(i);OGATE::PXR(i)=Q
    • B(g);SBLOCK,S_CUTR(i)::B(F)
  • Tries
    • Try
      • B(F);CHECK
      • Refutation
        • R(i);XB(F)
    • Try
      • Q(A);XP(b)
      • Threat
        • QAR1(A),XB(g)
      • Vars
        • R(e);N_GUARD::QAB1(A),XR(e)
        • R(i);OGATE::PXR(i)=Q
        • B(g);SBLOCK,S_CUTR(e)::B(F)
        • B(g);OGATE::QAB1(A)
        • B(g);SBLOCK,S_CUTR(i)::B(F)
      • Refutation
        • R(i);P_PINQ(A)
  • Actual
    • Q(A);
    • Threat
      • QAR1(A),XB(g)
    • Vars
      • R(e);N_GUARD::QAB1(A),XR(e)
      • R(i);OGATE::PXR(i)=Q
      • B(g);S_CUTR(e)::QAB1(A)
      • B(g);SBLOCK,S_CUTR(e)::B(F)
      • B(g);OGATE::QAB1(A)
      • B(g);SBLOCK,S_CUTR(i)::B(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).