MESON Chess Problem Database

Problem Display
PID: 117143 (1B6/3rpp2/3q1Q1K/3N1bnp/R1B1k1NR/1P1p1p2/3p1P2/1n5r w - - 0 1)

Kubbel, Leonid Ivanovich (AKA Kubbel, Karl Artur Leonid)

64 Shakhmatnoe obozrenie, 1935

1B6/3rpp2/3q1Q1K/3N1bnp/R1B1k1NR/1P1p1p2/3p1P2/1n5r

#2

10 + 13

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qa3
      • 2.Qe5#
    • 1...Qb4
      • 2.Qe5#
    • 1...Qc5
      • 2.Qe5#
    • 1...Qe5
      • 2.Qxe5#
    • 1...Qxf6+
      • 2.Sgxf6#
  • Tries
    • 1.Sh2+?
      • 1...Qf4
        • 2.Rxf4#
        • 2.Qe5#
      • 1...Bg4!
    • 1.Sc3+?
      • 1...Kf4
        • 2.Sh2#
      • 1...Sxc3!
    • 1.Bb5+?
      • 1...Qb4
        • 2.Qe5#
      • 1...Kxd5!
    • 1.Ba6+?
      • 1...Qb4
        • 2.Qe5#
      • 1...Kxd5!
  • Keys
    • 1.Sde3!
      • threat
        • 2.Bd5#
      • 1...Qxf6+
        • 2.Sxf6#
      • 1...Kf4
        • 2.Sh2#
      • 1...Qb4
        • 2.Qe5#
      • 1...Qd4
        • 2.Qxf5#
      • 1...Qd5
        • 2.Bxd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • Q(j);N_PINQ(H)::QAR1(H)
    • Q(j);N_PINQ(H)::QAR1(H),XQ(j)
    • Q(j);CHECK,XQ(H)::R(F)+S(E),DCHECK,XQ(j)
  • Tries
    • Try
      • S(E);CHECK
      • Refutation
        • B(g);P_SPINB(g)
    • Try
      • S(G);CHECK
      • Vars
        • K(f);P-FLIGHT,P_SPINB(g),P_SPINQ(j)::R(F)+S(E)
      • Refutation
        • S(a);XS(G)
    • Try
      • B(D);CHECK
      • Vars
        • Q(j);N_PINQ(H),P_SPINQ(j)::QAR1(H)
      • Refutation
        • K(f);S_FLIGHT,XS(G)
    • Try
      • B(D);CHECK
      • Vars
        • Q(j);N_PINQ(H),P_SPINQ(j)::QAR1(H)
      • Refutation
        • K(f);S_FLIGHT,XS(G)
  • Actual
    • S(G);
    • Threat
      • R(C)+B(D),DCHECK
    • Vars
      • Q(j);CHECK,XQ(H)::R(F)+S(E),DCHECK,XQ(j)
      • K(f);P-FLIGHT,P_SPINB(g),P_SPINQ(j)::R(F)+S(E)
      • Q(j);N_PINQ(H)::QAR1(H)
      • Q(j);N_PINQ(H),SBLOCK::QAB1(H),XB(g)
      • Q(j);N_PINQ(H)::R(C)+B(D),DCHECK,XQ(j)
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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).