MESON Chess Problem Database

Problem Display
PID: 231334 (1B6/5K2/NR3p1p/p2k3r/Q6p/1n2p3/2Pr4/8 w - - 0 1)

Birnov, Zinovy Markovich

64 Shakhmatnoe obozrenie, 1927

1B6/5K2/NR3p1p/p2k3r/Q6p/1n2p3/2Pr4/8

#2

6 + 9

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rd4
      • 2.Qc6#
    • 1...Re5
      • 2.Rd6#
  • Tries
    • 1.Sc7+?
      • 1...Kc5
        • 2.Rc6#
      • 1...Ke5!
    • 1.Rb5+?
      • 1...Sc5
        • 2.Rxc5#
      • 1...Kc6!
    • 1.cxb3?
      • threat
        • 2.Qc4#
      • 1...Rd4
        • 2.Qc6#
      • 1...Rc2!
  • Keys
    • 1.Re6!
      • threat
        • 2.Qe4#
      • 1...Rd4
        • 2.Qc6#
      • 1...Re5
        • 2.Rd6#
      • 1...Sd4
        • 2.c4#
      • 1...Sc5
        • 2.Sc7#
      • 1...f5
        • 2.Re5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • R(a);SBLOCK::QAB1(B)
    • R(g);SBLOCK::R1(D)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(f);P-FLIGHT::R1(D)
      • Refutation
        • K(f);P-FLIGHT
    • Try
      • R(D);CHECK
      • Vars
        • S(b);N_GUARD,P_SPINS(b)::R1(D),XS(b)
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • P(A);XS(b)
      • Threat
        • QAB1(B)
      • Vars
        • R(a);SBLOCK::QAB1(B)
      • Refutation
        • R(a);
  • Actual
    • R(D);
    • Threat
      • QAB1(B)
    • Vars
      • R(a);SBLOCK::QAB1(B)
      • R(g);SBLOCK::R1(D)
      • S(b);SBLOCK::P(A)
      • S(b);SBLOCK::S(C)
      • P(h);N_GUARD,S_CUTR(g)::R1(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).