MESON Chess Problem Database

Problem Display
PID: 6693 (K3B1b1/bP6/pk6/4N1nR/3Ppn2/2Rp3q/1r5B/Q7 w - - 0 1)

Barulin, Mikhail Mikhailovich

Isaev, Leonid Antonovich

1st Prize, The Problemist, 1930

K3B1b1/bP6/pk6/4N1nR/3Ppn2/2Rp3q/1r5B/Q7

#2

9 + 10

3098 FIDE Album (1914-1944) (I) 1971
1077 Boletim da UBP 1989
23 Die Schwalbe 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Qc8+
      • 2.bxc8S#
    • 1...Rb5
      • 2.Rc6#
    • 1...Sd5
      • 2.Sc4#
    • 1...Sfe6
      • 2.Sc4#
    • 1...Sge6
      • 2.Sd7#
  • Tries
    • 1.Qxb2+?
      • 1...Ka5
        • 2.Ra3#
      • 1...Bb3!
  • Keys
    • 1.Qa3!
      • threat
        • 2.Qc5#
      • 1...Qc8+
        • 2.bxc8S#
      • 1...a5
        • 2.Qd6#
      • 1...Rb4
        • 2.Qxb4#
      • 1...Rb5
        • 2.Rc6#
      • 1...Sfe6
        • 2.Sc4#
      • 1...Sge6
        • 2.Sd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • Q(c);CHECK,OGATE::PXQ(c)=S
    • R(a);SBLOCK::R1(C)
    • S(e);S_CUTB(j)::S(E)
    • S(f);S_CUTQ(c)::S(E)
  • Tries
    • Try
      • Q(A);CHECK,XR(a)
      • Vars
        • K(h);S_FLIGHT::R(C)
      • Refutation
        • B(j);P_SPINB(j)
  • Actual
    • Q(A);
    • Threat
      • QAB1(A)
    • Vars
      • Q(c);CHECK,OGATE::PXQ(c)=S
      • P(g);SBLOCK::QAR2(A)
      • R(a);N_GUARD::QAR2(A),XR(a)
      • R(a);SBLOCK::R1(C)
      • S(e);S_CUTB(j)::S(E)
      • S(f);S_CUTQ(c)::S(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).