MESON Chess Problem Database

Problem Display
PID: 202698 (2q1r1bb/8/1R6/P1k2r2/3R2Qp/2p2p1K/B2PN3/8 w - - 0 1)

Holladay, Edgar Dinwiddie

The Observer, 1950

(First published on Sun Apr 23 1950)

2q1r1bb/8/1R6/P1k2r2/3R2Qp/2p2p1K/B2PN3/8

#2

8 + 9

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rd5
      • 2.Rc4#
    • 1...Rf7
      • 2.Rd5#
    • 1...Bxd4
      • 2.Qxd4#
  • Tries
    • 1.Rc4+?
      • 1...Bxc4
        • 2.Qxc4#
      • 1...Kd5!
    • 1.Rd5+?
      • 1...Bxd5
        • 2.Qb4#
      • 1...Rxd5!
  • Keys
    • 1.Rd8!
      • threat
        • 2.Qb4#
      • 1...Rf4
        • 2.Qxc8#
      • 1...Rd5
        • 2.Qxc8#
      • 1...Rfe5
        • 2.Qxc8#
        • 2.d4#
      • 1...Rg5
        • 2.Qxc8#
      • 1...Rh5
        • 2.Qxc8#
      • 1...Rf6
        • 2.d4#
      • 1...Rf7
        • 2.Rd5#
      • 1...Rff8
        • 2.Qxc8#
      • 1...Re4
        • 2.Rxc8#
      • 1...Bc4
        • 2.Qxc4#
      • 1...Bd4
        • 2.Qxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • R(e);P_PINQ(F),SBLOCK,S_CUTB(h)::R1(E)
    • R(e);N_GUARD,P_PINQ(F),S_CUTB(h)::R1(E)
    • B(i);OGATE,XR(E)::QAB1(F),XB(i)
  • Tries
    • Try
      • R(E);CHECK
      • Vars
        • B(h);OGATE,XR(E)::QAR1(F),XB(h)
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • R(E);CHECK
      • Vars
        • B(h);XR(E)::QAB1(F)
      • Refutation
        • R(e);P_PINQ(F),XR(E)
  • Actual
    • R(E);
    • Threat
      • QAB1(F)
    • Vars
      • R(e);OGATE,P_PINQ(F)::QAR(F),XQ(f)
      • R(e);P_PINQ(F),S_CUTB(i)::P(B)
      • R(e);N_GUARD,P_PINQ(F),S_CUTB(h)::R1(E)
      • R(g);N_GUARD::R(E),XQ(f)
      • B(h);N_GUARD::QAR1(F),XB(h)
      • B(i);N_GUARD::QAB1(F),XB(i)
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).