MESON Chess Problem Database

Problem Display
PID: 129723 (3nQ3/3K3p/4B3/8/4kPPb/2P2Rr1/4prN1/8 w - - 0 1)

Gavrilov, Constantin Grigorievich

Shakhmatnoe obozrenie, 1909

3nQ3/3K3p/4B3/8/4kPPb/2P2Rr1/4prN1/8

#2

8 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rxg4
      • 2.Re3#
    • 1...Sxe6
      • 2.Qa8#
    • 1...Sf7
      • 2.Qa8#
  • Tries
    • 1.Bf5+?
      • 1...Kxf3
        • 2.Qe4#
      • 1...Kd5!
    • 1.Qg6+?
      • 1...Kxf3
        • 2.Bd5#
      • 1...hxg6!
  • Keys
    • 1.Qg8!
      • threat
        • 2.Bd5#
      • 1...Kxf3
        • 2.Bd5#
      • 1...Rfxf3
        • 2.Bf5#
        • 2.Qxh7#
      • 1...Rgxf3
        • 2.Bf5#
        • 2.Qxh7#
      • 1...Rxg4
        • 2.Re3#
      • 1...Sxe6
        • 2.Qa8#
      • 1...Sf7
        • 2.Qa8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • R(c);N_GUARD,XP(E)::R1(C)
    • S(g);OGATE,P_SPINS(g),XB(F)::QAB(H)
    • S(g);OGATE::QAB(H)
  • Tries
    • Try
      • B(F);CHECK
      • Vars
        • K(d);S_FLIGHT,XR(C)::QAB1(H)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • Q(H);CHECK
      • Vars
        • K(d);S_FLIGHT,XR(C)::B(F)
      • Refutation
        • P(f);XQ(H)
  • Actual
    • Q(H);
    • Threat
      • B(F)
    • Vars
      • K(d);S_FLIGHT,XR(C)::B(F)
      • R(c);N_GUARD,XP(E)::R1(C)
      • S(g);OGATE,XB(F)::QAB(H)
      • S(g);OGATE::QAB(H)
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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).