MESON Chess Problem Database

Problem Display
PID: 192643 (4N3/4P2p/2p2B2/5kpB/K1Q5/p2p2P1/4rn1n/8 w - - 0 1)

Holroyd, GC

The Observer, 1939

(First published on Sun Mar 12 1939)

4N3/4P2p/2p2B2/5kpB/K1Q5/p2p2P1/4rn1n/8

#2

7 + 9

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Tries
    • 1.Qd5+?
      • 1...Re5
        • 2.Qxe5#
      • 1...cxd5!
    • 1.Qd4?
      • threat
        • 2.Sg7#
      • 1...Ke6
        • 2.Sg7#
      • 1...Re5
        • 2.Qxe5#
      • 1...Rxe7!
    • 1.Qc5+?
      • 1...Ke4
        • 2.Sd6#
        • 2.Qe5#
      • 1...Re5
        • 2.Qxe5#
      • 1...Ke6!
  • Keys
    • 1.Qf7!
      • threat
        • 2.Sd6#
      • 1...Re4+
        • 2.Bd4#
      • 1...Ke4
        • 2.Qe6#
      • 1...Re6
        • 2.Qxh7#
      • 1...Se4
        • 2.Sg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • R(a);N_GUARD,P_SPINR(a)::QAR1(C),XR(a)
      • Refutation
        • P(h);XQ(C)
    • Try
      • Q(C);
      • Threat
        • S(G)
      • Vars
        • K(f);S_FLIGHT::S(G)
        • R(a);N_GUARD::QAR1(C),XR(a)
      • Refutation
        • R(a);XP(F)
    • Try
      • Q(C);CHECK
      • Vars
        • R(a);N_GUARD,P_SPINR(a)::QAR1(C),XR(a)
      • Refutation
        • K(f);S_FLIGHT
  • Actual
    • Q(C);
    • Threat
      • S(G)
    • Vars
      • R(a);CHECK,SBLOCK::QAR(C)+B(E)
      • K(f);S_FLIGHT::QAR2(C)
      • R(a);SBLOCK::QAB(C),XP(i)
      • S(b);SBLOCK::S(G)
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).