MESON Chess Problem Database

Problem Display
PID: 87474 (1q3R2/r2p1N1K/1P5B/1R3n2/2npk1p1/QN6/B1b1P3/4b3 w - - 0 1)

Costikyan, Simon

American Chess Problemist, 1950

1q3R2/r2p1N1K/1P5B/1R3n2/2npk1p1/QN6/B1b1P3/4b3

#2

10 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sb2
      • 2.Sc5#
    • 1...Sd2
      • 2.Sc5#
    • 1...Sxa3
      • 2.Sc5#
    • 1...Sce3
      • 2.Sc5#
    • 1...Sa5
      • 2.Sc5#
    • 1...Se5
      • 2.Sc5#
    • 1...Sxb6
      • 2.Sc5#
    • 1...Scd6
      • 2.Sc5#
      • 2.Re5#
    • 1...Sfe3
      • 2.Sg5#
    • 1...d5
      • 2.Sc5#
  • Tries
    • 1.Sd2+?
      • 1...Sxd2
        • 2.Bd5#
      • 1...Bxd2!
    • 1.Re5+?
      • 1...Sxe5
        • 2.Sc5#
      • 1...Qxe5!
  • Keys
    • 1.Qc1!
      • threat
        • 2.Sg5#
      • 1...Qf4
        • 2.Qxf4#
      • 1...Qd8
        • 2.Qf4#
      • 1...Bd2
        • 2.Qh1#
      • 1...Bh4
        • 2.Qh1#
      • 1...Sd2
        • 2.Sc5#
      • 1...Sce3
        • 2.Sc5#
      • 1...d5
        • 2.Sc5#
      • 1...d6
        • 2.Qf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 6
  • Sets
    • S(c);::S(D)
    • S(c);XQ(C)::S(D)
    • S(c);XP(F)::S(D)
    • S(g);SBLOCK::S(H)
    • P(i);P_PINS(H),SBLOCK::S(D)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • S(c);OGATE,XS(D)::B(A)
      • Refutation
        • B(a);XS(D)
    • Try
      • R(E);CHECK
      • Vars
        • S(c);XR(E)::S(D)
      • Refutation
        • Q(j);XR(E)
  • Actual
    • Q(C);
    • Threat
      • S(H)
    • Vars
      • Q(j);N_GUARD::QAR1(C),XQ(j)
      • Q(j);N_GUARD::QAR1(C)
      • B(a);OGATE::QAB(C)
      • S(c);::S(D)
      • P(i);P_PINS(H),SBLOCK::S(D)
      • P(i);P_PINS(H),S_CUTQ(j)::QAR1(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).