MESON Chess Problem Database

Problem Display
PID: 31032 (8/1b6/1qPBP3/5K2/1npkP3/Q1N2p2/2prpP2/b1N5 w - - 0 1)

Loyd, Sam

La Strategie, 1867

8/1b6/1qPBP3/5K2/1npkP3/Q1N2p2/2prpP2/b1N5

#2

9 + 10

5454 Near Snap 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Qa7
      • 2.Sb5#
    • 1...Qc7
      • 2.Sb5#
    • 1...Qd8
      • 2.Sb5#
    • 1...Qb5+
      • 2.Sxb5#
    • 1...Sa2
      • 2.Be5#
    • 1...Sd5
      • 2.Be5#
    • 1...Sa6
      • 2.Be5#
  • Tries
    • 1.S3xe2+?
      • 1...fxe2
        • 2.Qe3#
      • 1...Rxe2!
    • 1.Qxa1?
      • threat
        • 2.S3xe2#
        • 2.Sb5#
      • 1...Qa5+
        • 2.Sb5#
      • 1...Qb5+
        • 2.Sxb5#
      • 1...e1Q
        • 2.S3e2#
        • 2.Sb5#
      • 1...e1S
        • 2.S3e2#
        • 2.Sb5#
      • 1...e1B
        • 2.S3e2#
        • 2.Sb5#
      • 1...e1R
        • 2.S3e2#
        • 2.Sb5#
      • 1...Qc5+!
  • Keys
    • 1.Qa7!
      • threat
        • 2.Sb5#
      • 1...Qc5+
        • 2.Be5#
      • 1...Kxc3
        • 2.Qxa1#
      • 1...Bxc3
        • 2.Qxb6#
      • 1...Bxc6
        • 2.Qg7#
      • 1...Ba6
        • 2.Qg7#

Anticipated by 2511(1858)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 7
  • 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)
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).