MESON Chess Problem Database

Problem Display
PID: 144837 (K7/p1Q3n1/6p1/3N4/rp1k1N1R/B2P1p2/3p4/1B1nb2b w - - 0 1)

Shelley, HR

The Observer, 1920

(First published on Sun Jun 13 1920)

K7/p1Q3n1/6p1/3N4/rp1k1N1R/B2P1p2/3p4/1B1nb2b

#2

8 + 11

14868 Pirnie Collection 2012
15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sb2
      • 2.Bxb2#
    • 1...Sf2
      • 2.Bb2#
    • 1...Se3
      • 2.Bb2#
    • 1...b3
      • 2.Bc5#
      • 2.Qxg7#
  • Tries
    • 1.Sxg6+?
      • 1...Bxh4
        • 2.Qc4#
      • 1...Kxd5!
    • 1.Sxb4?
      • threat
        • 2.Sc2#
      • 1...f2+
        • 2.Sg2#
      • 1...Ke3
        • 2.Qc5#
      • 1...Se3
        • 2.Se2#
        • 2.Se6#
        • 2.Bb2#
      • 1...Rxb4!
    • 1.Qb6+?
      • 1...Ke5
        • 2.Qf6#
        • 2.d4#
      • 1...axb6+!
    • 1.Qd6?
      • threat
        • 2.Se2#
        • 2.Se6#
      • 1...Se6
        • 2.Se2#
        • 2.Sxe6#
      • 1...Bxh4!
    • 1.Qc5+?
      • 1...Ke5
        • 2.d4#
      • 1...Kxc5!
  • Keys
    • 1.Se3!
      • threat
        • 2.Sc2#
      • 1...f2+
        • 2.Sfg2#
      • 1...Kxe3
        • 2.Qc5#
      • 1...Sxe3
        • 2.Bb2#
      • 1...b3
        • 2.Qc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • S(a);N_GUARD::B(B),XS(a)
    • S(a);N_GUARD::B(B)
  • Tries
    • Try
      • S(D);CHECK,XP(i)
      • Vars
        • B(b);XR(E)::QAR1(G)
      • Refutation
        • K(h);P-FLIGHT,XS(F)
    • Try
      • S(F);XP(g)
      • Threat
        • S(F)
      • Vars
        • P(e);CHECK,S_CUTB(b)::R(E)+S(D)
        • K(h);S_FLIGHT::QAB(G)
      • Refutation
        • R(f);XS(F)
    • Try
      • Q(G);CHECK
      • Refutation
        • P(j);CHECK,XQ(G)
    • Try
      • Q(G);
      • Threat
        • DUALS(2)
      • Refutation
        • B(b);XR(E)
    • Try
      • Q(G);CHECK
      • Vars
        • K(h);OGATE,S_FLIGHT::P(C)
      • Refutation
        • K(h);P_SPINP(g),S_FLIGHT,XQ(G)
  • Actual
    • S(F);
    • Threat
      • S(F)
    • Vars
      • P(e);CHECK,S_CUTB(b)::R(E)+S(D)
      • K(h);S_FLIGHT,XS(F)::QAB(G)
      • S(a);N_GUARD,SBLOCK,XS(F)::B(B)
      • P(g);::QAB1(G)
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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).