MESON Chess Problem Database

Problem Display
PID: 551 (8/4N2b/7r/3BQp1R/5PkN/3Kp3/3n2PP/2b3R1 w - - 0 1)

Quack, Godfrey C

The Observer, 1963

8/4N2b/7r/3BQp1R/5PkN/3Kp3/3n2PP/2b3R1

#2

10 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Rg6
      • 2.Qxf5#
    • 1...Bg8
      • 2.Qxf5#
    • 1...Sb1
      • 2.Bf3#
    • 1...Sf1
      • 2.Bf3#
    • 1...Sb3
      • 2.Bf3#
    • 1...Sf3
      • 2.Bxf3#
    • 1...Sc4
      • 2.Bf3#
  • Tries
    • 1.Shxf5?
      • threat
        • 2.Rg5#
      • 1...Bxf5+
        • 2.Qxf5#
      • 1...Kxh5
        • 2.g4#
      • 1...Rg6
        • 2.Sxe3#
        • 2.Rh4#
      • 1...Sf3
        • 2.Bxf3#
      • 1...Se4
        • 2.Sxh6#
      • 1...Rxh5!
  • Keys
    • 1.Sexf5!
      • threat
        • 2.Rg5#
      • 1...Bxf5+
        • 2.Qxf5#
      • 1...Kxh5
        • 2.g4#
      • 1...Rxh5
        • 2.h3#
      • 1...Rg6
        • 2.Sxe3#
      • 1...Sf3
        • 2.Bxf3#
      • 1...Se4
        • 2.Sxh6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • R(f);S_CUTB(g)::QAB1(H),XP(e)
    • B(g);N_GUARD::QAB1(H),XP(e)
    • S(b);N_GUARD::B(G)
    • S(b);N_GUARD::B(G),XS(b)
  • Tries
    • Try
      • S(F);P_SPINS(F),XP(e)
      • Threat
        • R1(I)
      • Vars
        • B(g);CHECK,OGATE,XS(F)::QAB1(H),XB(g)
        • K(d);OGATE,S_FLIGHT,XR(I)::P(B)
        • S(b);N_GUARD::B(G),XS(b)
        • S(b);N_PINS(F)::S(F),XR(f)
      • Refutation
        • R(f);XR(I)
  • Actual
    • S(J);P_SPINS(J),XP(e)
    • Threat
      • R1(I)
    • Vars
      • B(g);CHECK,OGATE,XS(J)::QAB1(H),XB(g)
      • K(d);OGATE,S_FLIGHT,XR(I)::P(B)
      • R(f);SBLOCK,XR(I)::P(C)
      • R(f);N_PINS(J)::S(J),XP(c)
      • S(b);N_GUARD::B(G),XS(b)
      • S(b);N_PINS(J)::S(J),XR(f)
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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).