MESON Chess Problem Database

Problem Display
PID: 72048 (3Q4/4N3/B1p5/1r3pK1/1pk1p3/2n1n2R/PP3B2/2Rbb3 w - - 0 1)

Karlstrom, Alfred Olaf

Schackvarlden, 1943

3Q4/4N3/B1p5/1r3pK1/1pk1p3/2n1n2R/PP3B2/2Rbb3

#2

9 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Sf1
      • 2.Qd4#
      • 2.Qg8#
    • 1...Sc2
      • 2.b3#
    • 1...Sg2
      • 2.Qd4#
      • 2.Qg8#
    • 1...Sg4
      • 2.Qd4#
      • 2.Qg8#
  • Tries
    • 1.b3+?
      • 1...Kc5
        • 2.Bxe3#
      • 1...Bxb3!
  • Keys
    • 1.Sxf5!
      • threat
        • 2.Qd4#
      • 1...Kc5
        • 2.Qd4#
      • 1...Sxf5
        • 2.Qg8#
      • 1...Sc2
        • 2.b3#
      • 1...Sd5
        • 2.Sd6#
      • 1...c5
        • 2.Sxe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(d);N_SPINS(c),S_CUTB(a)::P(C)
  • Tries
    • Try
      • P(C);CHECK
      • Vars
        • K(f);N_SPINR(h),P-FLIGHT::B(D),XS(d)
      • Refutation
        • B(a);XP(C)
  • Actual
    • S(H);P_SPINS(H),XP(i)
    • Threat
      • QAR1(I)
    • Vars
      • K(f);N_PINS(H),N_SPINR(h),P-FLIGHT::QAB1(I)
      • S(d);N_GUARD,XS(H)::QAB(I)
      • S(d);N_SPINS(c),S_CUTB(a)::P(C)
      • S(d);N_PINS(H),SBLOCK::S(H)
      • P(j);N_PINS(H),SBLOCK::S(H),XS(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).