MESON Chess Problem Database

Problem Display
PID: 203775 (1b1Q2bB/8/n1p1r1r1/1p1pp3/pN1k2p1/K2N4/3P4/2R1RB2 w - - 0 1)

Clark, Cecil Henry Douglas

Chess Problem Research Pamphlet, 1954

1b1Q2bB/8/n1p1r1r1/1p1pp3/pN1k2p1/K2N4/3P4/2R1RB2

#2

9 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Rd6
      • 2.Bxe5#
    • 1...c5
      • 2.Qxd5#
  • Tries
    • 1.Sf2?
      • threat
        • 2.Re4#
      • 1...Rd6
        • 2.Bxe5#
      • 1...Sc5
        • 2.Sc2#
      • 1...Bd6!
    • 1.Rc4+?
      • 1...bxc4
        • 2.Sc2#
      • 1...Kxc4!
    • 1.Qg5?
      • threat
        • 2.Qe3#
        • 2.Qf4#
      • 1...Ref6
        • 2.Qe3#
      • 1...Rgf6
        • 2.Qe3#
      • 1...Rg7
        • 2.Qe3#
      • 1...Sc5
        • 2.Qe3#
      • 1...Rxg5!
    • 1.Qb6+?
      • 1...Sc5
        • 2.Qxc5#
      • 1...c5!
    • 1.Qd6?
      • threat
        • 2.Sxc6#
      • 1...Rxd6
        • 2.Bxe5#
      • 1...Sxb4
        • 2.Qxb4#
        • 2.Qc5#
      • 1...c5
        • 2.Sc6#
        • 2.Qxd5#
      • 1...Bxd6!
  • Keys
    • 1.Sc5!
      • threat
        • 2.Re4#
      • 1...Sxc5
        • 2.Sc2#
      • 1...Rd6
        • 2.Bxe5#
      • 1...Bd6
        • 2.Sxc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • R(i);N_GUARD,N_SPINP(e),P_SPINP(f),S_CUTB(k)::B(I),XP(f)
    • P(h);N_GUARD::QAR1(H),XP(e)
  • Tries
    • Try
      • S(F);
      • Threat
        • R1(B)
      • Vars
        • R(i);N_GUARD,N_SPINP(e),P_SPINP(f),S_CUTB(k)::B(I),XP(f)
        • S(g);SBLOCK::S(G)
      • Refutation
        • B(k);N_SPINP(e),P_PINS(G),P_SPINP(f)
    • Try
      • R(A);CHECK
      • Vars
        • P(d);SBLOCK,XR(A)::S(G)
      • Refutation
        • K(b);N_SPINP(e),P-FLIGHT,XR(A)
    • Try
      • Q(H);N_PINP(e),P_PINP(f)
      • Threat
        • DUALS(2)
      • Vars
        • R(i);N_SPINP(f)::QAB1(H)
        • R(j);N_SPINP(f)::QAB1(H)
        • S(g);::QAB1(H)
      • Refutation
        • R(j);XQ(H)
    • Try
      • Q(H);CHECK,N_PINP(e),P_PINP(f)
      • Vars
        • S(g);N_GUARD,P_SPINS(g)::QAB1(H),XS(g)
      • Refutation
        • P(h);N_SPINP(f),P_SPINP(h)
    • Try
      • Q(H);
      • Threat
        • S(G),XP(h)
      • Vars
        • R(i);N_GUARD,N_SPINP(e),P_SPINP(f),XQ(H)::B(I),XP(f)
      • Refutation
        • B(k);N_SPINP(e),P_PINS(G),P_SPINP(f),XQ(H)
  • Actual
    • S(F);
    • Threat
      • R1(B)
    • Vars
      • S(g);SBLOCK,XS(F)::S(G)
      • R(i);N_GUARD,N_SPINP(e),P_SPINP(f),S_CUTB(k)::B(I),XP(f)
      • B(k);N_SPINP(e),P_SPINP(f),S_CUTR(i)::S(G),XP(h)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).