MESON Chess Problem Database

Problem Display
PID: 162041 (1n2Q3/2b2p1b/1p6/3k1N2/1PN1Rp2/p7/P1n5/1K6 w - - 0 1)

Alvey, George Clarence Vincent

The Observer, 1923

(First published on Sun Dec 23 1923)

1n2Q3/2b2p1b/1p6/3k1N2/1PN1Rp2/p7/P1n5/1K6

#2

7 + 9

15239 Valois Notebooks 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Bd6
      • 2.Sxb6#
    • 1...Sa1
      • 2.Rd4#
    • 1...Se1
      • 2.Rd4#
    • 1...Se3
      • 2.Rd4#
    • 1...Sd4
      • 2.Rxd4#
    • 1...Sa6
      • 2.Qa8#
    • 1...Sd7
      • 2.Qa8#
    • 1...f6
      • 2.Qe6#
  • Tries
    • 1.Sce3+?
      • 1...Sxe3
        • 2.Rd4#
      • 1...fxe3!
    • 1.Sfd6?
      • threat
        • 2.Qb5#
      • 1...Bxd6
        • 2.Sxb6#
      • 1...Bxe4
        • 2.Qxe4#
      • 1...Sd7
        • 2.Qa8#
      • 1...Sa6
        • 2.Qa8#
      • 1...Sc6
        • 2.Qxf7#
      • 1...b5
        • 2.Qxb5#
      • 1...Sd4!
  • Keys
    • 1.Qb5+!
      • 1...Kxe4
        • 2.Sd2#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 8
  • Sets
    • B(f);N_GUARD::S(D),XP(e)
    • S(a);N_GUARD::R1(E)
    • S(a);N_GUARD::R1(E),XS(a)
    • S(i);OGATE::QAB(G)
    • P(g);N_GUARD::QAB1(G)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • S(a);XS(D)::R1(E)
      • Refutation
        • P(c);XS(D)
    • Try
      • S(F);
      • Threat
        • QAR2(G)
      • Vars
        • B(f);N_GUARD,SBLOCK,XS(F)::S(D),XP(e)
        • B(h);OGATE,XR(E)::QAB1(G),XB(h)
        • S(i);OGATE::QAB(G)
        • S(i);SBLOCK::QAB(G),XP(g)
        • P(e);::QAR2(G),XP(e)
      • Refutation
        • S(a);P_PINR(E)
  • Actual
    • Q(G);CHECK
    • Vars
      • K(d);S_FLIGHT,XR(E)::S(D)
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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).