MESON Chess Problem Database

Problem Display
PID: 274542 (B2B1n2/b3r3/Rq5N/4kPpb/3N1p2/Qp3P2/3R4/4K3 w - - 0 1)

Easter, Norris

The Problemist, 1933

B2B1n2/b3r3/Rq5N/4kPpb/3N1p2/Qp3P2/3R4/4K3

#2

10 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Kf6+
      • 2.Qxe7#
    • 1...Qa5
      • 2.Qd6#
    • 1...Qb5
      • 2.Qd6#
    • 1...Qd6
      • 2.Qxd6#
    • 1...Qb7
      • 2.Qd6#
    • 1...Bg4
      • 2.Sxg4#
    • 1...Bg6
      • 2.Sg4#
    • 1...Bf7
      • 2.Sg4#
    • 1...Be8
      • 2.Sg4#
  • Tries
    • 1.Sc6+?
      • 1...Kf6+
        • 2.Qxe7#
      • 1...Qxc6!
    • 1.Re2+?
      • 1...Kf6
        • 2.Qxe7#
      • 1...Kxd4!
    • 1.Qc5+?
      • 1...Kf6+
        • 2.Qxe7#
      • 1...Qxc5!
    • 1.Qxe7+?
      • 1...Qe6
        • 2.Sc6#
        • 2.Bc7#
      • 1...Se6!
  • Keys
    • 1.Qb2!
      • threat
        • 2.Sc6#
      • 1...Kd6+
        • 2.Se6#
      • 1...Kf6+
        • 2.Se2#
      • 1...Qxd4
        • 2.Re2#
      • 1...Qxh6
        • 2.Re2#
      • 1...Bxf3
        • 2.Sxf3#
      • 1...Qc6
        • 2.Sxc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 8
  • Sets
    • K(c);CHECK,P_SPINQ(f),P_SPINR(h),S_CUTS(i),S_FLIGHT::QAB1(C),XR(h)
    • Q(f);N_GUARD,P_PINR(B)::QAB1(C)
    • Q(f);N_GUARD::QAB1(C)
    • Q(f);N_GUARD::QAB1(C),XQ(f)
    • B(e);N_GUARD::S(H),XB(e)
    • B(e);N_GUARD::S(H)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • K(c);CHECK,P_SPINR(h),S_FLIGHT::QAB1(C),XR(h)
      • Refutation
        • Q(f);XS(E)
    • Try
      • R(B);CHECK
      • Vars
        • K(c);N_GUARD,P_PINR(B),P_SPINQ(f),P_SPINR(h),S_FLIGHT::QAB1(C),XR(h)
      • Refutation
        • K(c);P_PINR(B),S_FLIGHT,XS(E)
    • Try
      • Q(C);CHECK
      • Vars
        • K(c);CHECK,P_SPINQ(f),P_SPINR(h),S_CUTS(i),S_FLIGHT::QAB1(C),XR(h)
      • Refutation
        • Q(f);XQ(C)
    • Try
      • Q(C);CHECK,XR(h)
      • Refutation
        • S(i);P_SPINS(i)
  • Actual
    • Q(C);
    • Threat
      • QAB(C)+S(E),DCHECK
    • Vars
      • K(c);CHECK,P_SPINQ(f),S_FLIGHT::R(B)+S(E)
      • K(c);CHECK,P_SPINQ(f),P_SPINR(h),S_FLIGHT::QAB(C)+S(E)
      • Q(f);P_SPINQ(f),XS(E)::R(B)
      • Q(f);XS(H)::R(B)
      • B(e);XP(D)::QAB(C)+S(E),DCHECK,XB(e)
      • Q(f);::QAB(C)+S(E),DCHECK,XQ(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).