MESON Chess Problem Database

Problem Display
PID: 520 (1B1RbQ2/2p1r1p1/1n2P2p/1N2k1P1/2p2Np1/1nP1Kp1q/5P2/8 w - - 0 1)

Hawes, Frederick Thomas

Ravenscroft, Frank

2nd HM., The Observer, 1957

1B1RbQ2/2p1r1p1/1n2P2p/1N2k1P1/2p2Np1/1nP1Kp1q/5P2/8

#2

10 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Bd7
      • 2.Bxc7#
    • 1...Sd4
      • 2.cxd4#
    • 1...Sa4
      • 2.Rd5#
    • 1...Sd5+
      • 2.Rxd5#
    • 1...Sd7
      • 2.Bxc7#
    • 1...Sa8
      • 2.Rd5#
    • 1...Sc8
      • 2.Rd5#
    • 1...g6
      • 2.Qf6#
  • Tries
    • 1.Qxg7+?
      • 1...Kf5
        • 2.Qf6#
      • 1...Rxg7!
  • Keys
    • 1.Sd4!
      • threat
        • 2.Qf5#
      • 1...Sd5+
        • 2.Rxd5#
      • 1...Sxd4
        • 2.cxd4#
      • 1...Bd7
        • 2.Bxc7#
      • 1...Sd7
        • 2.Bxc7#
      • 1...Rd7
        • 2.Sc6#
      • 1...Rf7
        • 2.Sg6#
      • 1...Bg6
        • 2.Sc6#
        • 2.Sxg6#
      • 1...Bf7
        • 2.Qxg7#
      • 1...g3
        • 2.Sxf3#
      • 1...g6
        • 2.Qf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • B(l);S_CUTR(j)::B(H),XP(i)
    • S(a);OGATE::P(B),XS(a)
    • S(g);N_GUARD::R1(I)
    • S(g);CHECK,N_GUARD::R1(I),XS(g)
    • S(g);S_CUTR(j)::B(H),XP(i)
    • P(k);N_GUARD::QAB1(J)
  • Tries
    • Try
      • Q(J);CHECK,XP(k)
      • Vars
        • K(f);N_SPINP(i),P-FLIGHT,P_PINP(G)::QAR1(J)
      • Refutation
        • R(j);XQ(J)
  • Actual
    • S(E);
    • Threat
      • QAR1(J)
    • Vars
      • S(g);CHECK,N_GUARD::R1(I),XS(g)
      • S(a);OGATE,XS(E)::P(B),XS(a)
      • B(l);S_CUTR(j)::B(H),XP(i)
      • S(g);S_CUTR(j)::B(H),XP(i)
      • R(j);S_CUTB(l)::S(E)
      • R(j);S_CUTB(l)::S(D)
      • B(l);S_CUTR(j)::QAB(J),XP(k)
      • P(e);N_GUARD,S_CUTQ(c)::S(E),XP(b)
      • P(k);N_GUARD::QAB1(J)
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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).