MESON Chess Problem Database

Problem Display
PID: 507 (8/8/4p2K/8/2B5/2BR3b/N3p1Rp/Nk4qQ w - - 0 1)

Phillips, BC

The Observer, 1957

8/8/4p2K/8/2B5/2BR3b/N3p1Rp/Nk4qQ

#2

8 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Qc1+
      • 2.Qxc1#
    • 1...Qe1
      • 2.Qxe1#
    • 1...e1S
      • 2.Rd1#
    • 1...e1B
      • 2.Rd1#
  • Tries
    • 1.Sc2?
      • threat
        • 2.Sa3#
      • 1...Qc1+
        • 2.Qxc1#
      • 1...Kxc2!
    • 1.Rd2?
      • threat
        • 2.Bd3#
      • 1...e1S
        • 2.Rd1#
      • 1...Bf5!
    • 1.Rd5?
      • threat
        • 2.Rb5#
      • 1...Qc1+
        • 2.Qxc1#
      • 1...exd5!
    • 1.Rd7?
      • threat
        • 2.Rb7#
      • 1...Qc1+
        • 2.Qxc1#
      • 1...e1Q
        • 2.Bd3#
      • 1...e1S
        • 2.Rd1#
      • 1...e1B
        • 2.Bd3#
        • 2.Rd1#
      • 1...e1R
        • 2.Bd3#
      • 1...Bxg2!
    • 1.Rd8?
      • threat
        • 2.Rb8#
      • 1...Qc1+
        • 2.Qxc1#
      • 1...e1Q
        • 2.Bd3#
      • 1...e1S
        • 2.Rd1#
      • 1...e1B
        • 2.Bd3#
        • 2.Rd1#
      • 1...e1R
        • 2.Bd3#
      • 1...Bxg2!
  • Keys
    • 1.Rd6!
      • threat
        • 2.Rb6#
      • 1...Qc1+
        • 2.Qxc1#
      • 1...e1Q
        • 2.Bd3#
      • 1...e1S
        • 2.Rd1#
      • 1...e1B
        • 2.Bd3#
        • 2.Rd1#
      • 1...e1R
        • 2.Bd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • Q(b);CHECK,OGATE::QAR1(B),XQ(b)
    • Q(b);OGATE::QAR(B),XQ(b)
    • P(c);N_GUARD,N_SPINQ(b),S_CUTQ(b)::R(F)
  • Tries
    • Try
      • S(A);
      • Threat
        • S(A)
      • Vars
        • Q(b);CHECK,OGATE::QAR1(B),XQ(b)
      • Refutation
        • K(a);N_SPINQ(b),P_SPINP(c),S_FLIGHT,XS(A)
    • Try
      • R(F);
      • Threat
        • B(G)
      • Vars
        • P(c);N_GUARD,N_SPINQ(b),S_CUTQ(b)::R(F)
      • Refutation
        • B(e);
    • Try
      • R(F);
      • Threat
        • R(F)
      • Vars
        • Q(b);CHECK,OGATE::QAR1(B),XQ(b)
      • Refutation
        • P(f);XR(F)
    • Try
      • R(F);
      • Threat
        • R(F)
      • Vars
        • Q(b);CHECK,OGATE::QAR1(B),XQ(b)
        • P(c);N_SPINQ(b)::B(G)
        • P(c);N_GUARD,N_SPINQ(b),S_CUTQ(b)::R(F)
      • Refutation
        • B(e);XR(D)
    • Try
      • R(F);
      • Threat
        • R(F)
      • Vars
        • Q(b);CHECK,OGATE::QAR1(B),XQ(b)
        • P(c);N_SPINQ(b)::B(G)
        • P(c);N_GUARD,N_SPINQ(b),S_CUTQ(b)::R(F)
      • Refutation
        • B(e);XR(D)
  • Actual
    • R(F);
    • Threat
      • R(F)
    • Vars
      • Q(b);CHECK,OGATE::QAR1(B),XQ(b)
      • P(c);N_SPINQ(b)::B(G)
      • P(c);N_GUARD,N_SPINQ(b),S_CUTQ(b)::R(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).