MESON Chess Problem Database

Problem Display
PID: 71715 (n2K1RB1/2P1Qp1r/1B1pp2p/1P2k1bR/1qnp1NP1/3r1PP1/8/8 w - - 0 1)

Gavrilov, Constantin Grigorievich

Xadrez Brasileiro, 1935

n2K1RB1/2P1Qp1r/1B1pp2p/1P2k1bR/1qnp1NP1/3r1PP1/8/8

#2

12 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...d5
      • 2.Sxd3#
    • 1...f5
      • 2.Rxf5#
    • 1...f6
      • 2.Qxf6#
      • 2.Qxe6#
  • Tries
    • 1.Rxg5+?
      • 1...f5
        • 2.Rgxf5#
        • 2.Rfxf5#
        • 2.Qf6#
        • 2.Qxe6#
      • 1...hxg5!
    • 1.Qxg5+?
      • 1...f5
        • 2.Qf6#
      • 1...hxg5!
  • Keys
    • 1.Sxe6!
      • threat
        • 2.Sf4#
      • 1...Kd5
        • 2.Sf4#
      • 1...Sxc7
        • 2.Sxc7#
      • 1...fxe6
        • 2.Rf5#
      • 1...d5
        • 2.Sc5#
      • 1...f5
        • 2.Rxf5#
      • 1...f6
        • 2.Sg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • P(g);SBLOCK::S(C),XR(a)
    • P(j);N_SPINB(f),OGATE::R1(K),XP(j)
  • Tries
    • Try
      • R(F);CHECK,N_SPINQ(I),XB(f)
      • Refutation
        • P(i);XR(F)
    • Try
      • Q(I);CHECK,N_PINP(h),N_SPINQ(I),XB(f)
      • Vars
        • P(j);P_SPINP(j)::QAB1(I)
      • Refutation
        • P(i);P_SPINP(i),XQ(I)
  • Actual
    • S(C);XP(h)
    • Threat
      • QAR(I)+S(C)
    • Vars
      • K(e);P-FLIGHT::S(C)
      • S(l);XP(H)::QAR(I)+S(C),XS(l)
      • P(j);OGATE,P_SPINP(j),XS(C)::R1(K)
      • P(g);SBLOCK::QAR(I)+S(C)
      • P(j);N_SPINB(f),OGATE::R1(K),XP(j)
      • P(j);N_PINQ(I)::QAR(I)+S(C)
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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).