MESON Chess Problem Database

Problem Display
PID: 106027 (4R3/B7/3R4/2qB1K2/1p6/2N1P3/1QPkp3/4b3 w - - 0 1)

Rirakhovski, Abram

Vecherni Izvestiya, 1930

4R3/B7/3R4/2qB1K2/1p6/2N1P3/1QPkp3/4b3

#2

9 + 5

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe3
      • 2.Bxe3#
    • 1...Qc4
      • 2.Bxc4#
    • 1...Qxd5+
      • 2.Rxd5#
    • 1...Qc6
      • 2.Bxc6#
    • 1...Qc8+
      • 2.Be6#
  • Tries
    • 1.Se4+?
      • 1...Kd1
        • 2.Qb1#
      • 1...Kxe3!
  • Keys
    • 1.Sa2!
      • threat
        • 2.Qc1#
      • 1...Qxc2+
        • 2.Be4#
      • 1...Qxd5+
        • 2.Rxd5#
      • 1...Qc8+
        • 2.Be6#
      • 1...Kd1
        • 2.Qc1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • Q(e);N_PINB(E),OGATE,XP(D)::B(H),XQ(e)
    • Q(e);N_PINB(E)::R(G)+B(E),XQ(e)
    • Q(e);CHECK,OGATE,P_SPINQ(e),XB(E)::R(G),XQ(e)
    • Q(e);CHECK,N_PINB(E)::R(G)+B(E)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR2(A)
      • Refutation
        • K(b);P_SPINQ(e),S_FLIGHT,XP(D)
  • Actual
    • S(C);
    • Threat
      • QAB1(A)
    • Vars
      • Q(e);CHECK,N_PINB(E),P_SPINQ(e),XP(B)::R(G)+B(E)
      • Q(e);CHECK,OGATE,P_SPINQ(e),XB(E)::R(G),XQ(e)
      • Q(e);CHECK,N_PINB(E)::R(G)+B(E)
      • K(b);P-FLIGHT::QAR1(A)
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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).