MESON Chess Problem Database

Problem Display
PID: 106279 (b2R2Q1/8/2p2KB1/3q1N2/1B3pp1/N2k1P2/Pp2p3/2n1r3 w - - 0 1)

Pituk, Alexander

Praca, 1958

b2R2Q1/8/2p2KB1/3q1N2/1B3pp1/N2k1P2/Pp2p3/2n1r3

#2

9 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qd4+
      • 2.Rxd4#
    • 1...Qd6+
      • 2.Rxd6#
    • 1...Qd7
      • 2.Rxd7#
      • 2.Qc4#
    • 1...Qxd8+
      • 2.Qxd8#
  • Tries
    • 1.Se3+?
      • 1...Kd4
        • 2.Sac2#
        • 2.Sec2#
      • 1...Kxe3!
    • 1.Sd6+?
      • 1...Kd4
        • 2.Sc2#
      • 1...Qe4
        • 2.Sdc4#
      • 1...Qf5+
        • 2.Sxf5#
      • 1...Ke3!
    • 1.Qe8?
      • threat
        • 2.Qe4#
      • 1...Qd4+
        • 2.Sxd4#
        • 2.Rxd4#
      • 1...Qd6+
        • 2.Rxd6#
      • 1...Qxd8+
        • 2.Qxd8#
      • 1...gxf3!
  • Keys
    • 1.Sc2!
      • threat
        • 2.Sfe3#
      • 1...Qd4+
        • 2.Sfxd4#
      • 1...Qd6+
        • 2.Sxd6#
      • 1...Qxd8+
        • 2.Se7#
      • 1...Kxc2
        • 2.Se3#
      • 1...Kc4
        • 2.Sd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(h);CHECK,OGATE::R1(H),XQ(h)
    • Q(h);CHECK,OGATEB::R(H),XQ(h)
    • Q(h);CHECK,N_SPINQ(h),OGATE,XR(H)::QAR(I),XQ(h)
  • Tries
    • Try
      • S(E);CHECK
      • Refutation
        • K(e);N_SPINQ(h),P-FLIGHT,XS(E)
    • Try
      • S(E);CHECK,N_PINQ(h)
      • Vars
        • K(e);P-FLIGHT::S(B)
        • Q(h);P_SPINQ(h)::R(H)+S(E)
        • Q(h);CHECK,P_SPINQ(h)::R(H)+S(E),XQ(h)
      • Refutation
        • K(e);P-FLIGHT
    • Try
      • Q(I);
      • Threat
        • QAB1(I)
      • Vars
        • Q(h);CHECK,OGATEB::R(H),XQ(h)
        • Q(h);CHECK,N_SPINQ(h),OGATE,XR(H)::QAR(I),XQ(h)
      • Refutation
        • P(g);XP(C)
  • Actual
    • S(B);
    • Threat
      • B(G)+S(E)
    • Vars
      • Q(h);CHECK,N_GUARD::B(G)+S(E),XQ(h)
      • Q(h);CHECK,N_SPINQ(h),XR(H)::B(G)+S(E)
      • K(e);N_SPINQ(h),S_FLIGHT,XS(B)::B(G)+S(E),DCHECK
      • K(e);S_FLIGHT::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).