MESON Chess Problem Database

Problem Display
PID: 2511 (1b6/1qPB4/5K2/1npkP3/Q1N2p2/2prpP2/b1N5/8 w - - 0 1)

Loyd, Sam

New York Albion, 1858

1b6/1qPB4/5K2/1npkP3/Q1N2p2/2prpP2/b1N5/8

#2

8 + 10

1679 American Chess Nuts 1868
5206 Sam Loyd and His Chess Problems 1913
5454 Near Snap 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Qa8
      • 2.Sb6#
    • 1...Qc8
      • 2.Sb6#
    • 1...Qb6+
      • 2.Sxb6#
    • 1...Sa3
      • 2.Be6#
    • 1...Sd6
      • 2.Be6#
    • 1...Sa7
      • 2.Be6#
  • Tries
    • 1.S4xe3+?
      • 1...fxe3
        • 2.Qe4#
      • 1...Rxe3!
    • 1.Qxa2?
      • threat
        • 2.S4xe3#
        • 2.Sb6#
      • 1...Qa6+
        • 2.Sb6#
      • 1...Qb6+
        • 2.Sxb6#
      • 1...e2
        • 2.S4e3#
        • 2.Sb6#
      • 1...Qc6+!
  • Keys
    • 1.Qa8!
      • threat
        • 2.Sb6#
      • 1...Qc6+
        • 2.Be6#
      • 1...Kxc4
        • 2.Qxa2#
      • 1...Bxc4
        • 2.Qxb7#
      • 1...Bxc7
        • 2.Qg8#
      • 1...Ba7
        • 2.Qg8#

This anticipates 31032(1867)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 6
  • Sets
    • Q(i);N_GUARD::S(D)
    • Q(i);CHECK,N_GUARD::S(D),XQ(i)
    • S(f);::B(H)
  • Tries
    • Try
      • S(D);CHECK,XP(d)
      • Vars
        • P(e);XS(D)::QAB1(C)
      • Refutation
        • R(c);XS(D)
    • Try
      • Q(C);XB(a)
      • Threat
        • DUALS(2)
      • Vars
        • Q(i);CHECK::QAB(C)+S(D),DCHECK
        • Q(i);CHECK::QAB(C)+S(D),DCHECK,XQ(i)
      • Refutation
        • Q(i);CHECK
  • Actual
    • Q(C);P_PINQ(i)
    • Threat
      • S(D)
    • Vars
      • Q(i);CHECK::B(H)
      • K(h);N_SPINQ(i),OGATEB,S_FLIGHT,XS(D)::QAB(C),XB(a)
      • B(a);SBLOCK,XS(D)::QAB(C),XQ(i)
      • B(j);OGATE,XP(G)::QAB(C)
      • B(j);OGATE::QAB(C)
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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).