MESON Chess Problem Database

Problem Display
PID: 11138 (3K1R2/4p3/4N3/3p1N2/Q1nBk3/7R/1p2r3/1qb4b w - - 0 1)

Easter, Norris

1st Prize, Tijdschrift vd KNSB, 1936

3K1R2/4p3/4N3/3p1N2/Q1nBk3/7R/1p2r3/1qb4b

#2

7 + 9

3098 FIDE Album (1914-1944) (I) 1971

SOLUTION

  • SOUND
  • Sets
    • 1...Bf4
      • 2.Sc5#
  • Tries
    • 1.Sd6+?
      • 1...Sxd6
        • 2.Sc5#
      • 1...exd6!
    • 1.Qb3?
      • threat
        • 2.Sg3#
      • 1...Qd3
        • 2.Qxd3#
      • 1...Rg2
        • 2.Qf3#
      • 1...Bf4
        • 2.Sc5#
      • 1...Re3!
  • Keys
    • 1.Qd1!
      • threat
        • 2.Sg3#
      • 1...Qd3
        • 2.Qxd3#
      • 1...Rd2
        • 2.Qg4#
      • 1...Rg2
        • 2.Qf3#
      • 1...Re3
        • 2.Rh4#
      • 1...Bd2
        • 2.Qxb1#
      • 1...Bf4
        • 2.Sc5#
      • 1...Sd2
        • 2.Qxe2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • B(b);SBLOCK::S(E)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • S(f);XS(D)::S(E)
      • Refutation
        • P(i);XS(D)
    • Try
      • Q(B);
      • Threat
        • S(D)
      • Vars
        • Q(a);N_GUARD::QAB1(B),XQ(a)
        • R(e);S_CUTB(c)::QAB1(B)
        • B(b);SBLOCK::S(E)
      • Refutation
        • R(e);
  • Actual
    • Q(B);
    • Threat
      • S(D)
    • Vars
      • Q(a);N_GUARD::QAB1(B),XQ(a)
      • R(e);OGATE::QAR2(B)
      • R(e);OGATE::QAB1(B)
      • R(e);S_CUTB(b)::R(A)
      • B(b);OGATE::QAB(B),XQ(a)
      • B(b);SBLOCK::S(E)
      • S(f);N_GUARD,S_CUTB(b)::QAR2(B),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).