MESON Chess Problem Database

Problem Display
PID: 51089 (QRb5/p2p4/kp1Pp3/1p2P3/1K6/6nR/8/6n1 w - - 0 1)

Anonymous

Burnley Express, 1881

QRb5/p2p4/kp1Pp3/1p2P3/1K6/6nR/8/6n1

#2

6 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Bb7
      • 2.Qxb7#
    • 1...Sf1
      • 2.Ra3#
    • 1...Sh1
      • 2.Ra3#
    • 1...Se2
      • 2.Ra3#
    • 1...Se4
      • 2.Ra3#
    • 1...Sf5
      • 2.Ra3#
    • 1...Sh5
      • 2.Ra3#
  • Tries
    • 1.Qg2?
      • threat
        • 2.Qa2#
      • 1...S3e2
        • 2.Ra3#
      • 1...S1e2!
    • 1.Qc6?
      • threat
        • 2.Qxb5#
        • 2.Qxc8#
      • 1...Bb7
        • 2.Qxb5#
        • 2.Qxb7#
      • 1...dxc6!
  • Keys
    • 1.Qh1!
      • 1...Sxh3
        • 2.Qa1#
      • 1...Sxh1
        • 2.Ra3#
      • 1...S1e2
        • 2.Qa1#
      • 1...Bb7
        • 2.Qxb7#
      • 1...Sf3
        • 2.Qa1#
      • 1...Sf1
        • 2.Ra3#
      • 1...S3e2
        • 2.Ra3#
      • 1...Se4
        • 2.Ra3#
      • 1...Sf5
        • 2.Ra3#
      • 1...Sh5
        • 2.Ra3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • B(i);N_GUARD::QAB1(E),XB(i)
    • S(b);OGATE::R(A)
    • S(b);OGATE,SBLOCK::R(A)
  • Tries
    • Try
      • Q(E);N_PINP(g)
      • Threat
        • QAR(E)
      • Vars
        • S(b);OGATE::R(A)
      • Refutation
        • S(a);
    • Try
      • Q(E);N_PINP(g),P_PINP(e)
      • Threat
        • DUALS(2)
      • Refutation
        • P(h);N_SPINP(e),XQ(E)
  • Actual
    • Q(E);N_PINP(g)
    • Vars
      • S(a);OGATE,XR(A)::QAR(E)
      • S(b);OGATE,XQ(E)::R(A)
      • S(a);OGATE::QAR(E)
      • B(i);N_GUARD::QAB1(E),XB(i)
      • S(b);OGATE::R(A)
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).