MESON Chess Problem Database

Problem Display
PID: 41905 (5K2/4Q1p1/1PR4N/1r2p3/1N1bkB2/5pP1/B1r5/8 w - - 0 1)

Alvey, George Clarence Vincent

2nd Prize, Hampshire Telegraph and Post, 1920/I

5K2/4Q1p1/1PR4N/1r2p3/1N1bkB2/5pP1/B1r5/8

#2

9 + 7

3360 Simple Two-move Themes 1924
56 The Problemist 2003
5293 A selection of chess problems by G. C. Alvey 2004
15148 Sadier Collection 2015

SOLUTION

  • SOUND
  • Sets
    • 1...Rd5
      • 2.Bxd5#
    • 1...Rxb6
      • 2.Bd5#
    • 1...gxh6
      • 2.Qh7#
    • 1...g5
      • 2.Qh7#
  • Keys
    • 1.Qb7!
      • threat
        • 2.Rc5#
      • 1...Bc5+
        • 2.Rd6#
      • 1...Rxc6
        • 2.Bb1#
      • 1...Rxb4
        • 2.Rc3#
      • 1...Rxb6
        • 2.Bd5#
      • 1...Bxb6
        • 2.Rc4#
      • 1...exf4
        • 2.Re6#
      • 1...gxh6
        • 2.Qh7#
      • 1...Ba1
        • 2.Rc4#
      • 1...Bg1
        • 2.Rc4#
      • 1...Bb2
        • 2.Rc4#
      • 1...Bf2
        • 2.Rc4#
      • 1...Bc3
        • 2.Rc4#
      • 1...Be3
        • 2.Rc4#
      • 1...Rcc5
        • 2.Rxc5#
      • 1...Rbc5
        • 2.Rxc5#
      • 1...Rd5
        • 2.Bxd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 13
    • REMOVED MATES = 1
  • Sets
    • R(e);N_GUARD::B(A),XR(e)
    • R(e);N_GUARD,XP(E)::B(A)
    • P(g);OGATE,XS(G)::QAB(H)
    • P(g);OGATE::QAB(H)
  • Actual
    • Q(H);N_PINP(f)
    • Threat
      • QAB(H)+R(F)
    • Vars
      • B(c);CHECK,S_CUTR(a),S_CUTR(e)::QAB(H)+R(F)
      • R(a);OGATEB,P_SPINR(a),XR(F)::B(A)
      • R(e);N_GUARD,XS(C)::QAB(H)+R(F)
      • R(e);N_GUARD,XP(E)::B(A)
      • B(c);XP(E)::QAB(H)+R(F),DCHECK
      • P(f);XB(D)::QAB(H)+R(F),DCHECK
      • P(g);OGATE,XS(G)::QAB(H)
      • B(c);::QAB(H)+R(F),DCHECK
      • R(a);::QAB(H)+R(F),XR(a)
      • R(e);::QAB(H)+R(F),XR(e)
      • R(e);N_GUARD::B(A),XR(e)
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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).