MESON Chess Problem Database

Problem Display
PID: 43672 (2BK4/b1p5/1B4R1/5p2/R1n1nk1P/2pQ3P/3rP3/2N5 w - - 0 1)

Easter, Norris

The Problemist, 1928

2BK4/b1p5/1B4R1/5p2/R1n1nk1P/2pQ3P/3rP3/2N5

#2

10 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd3+
      • 2.Sxd3#
    • 1...Sb2
      • 2.Bxc7#
    • 1...Sa3
      • 2.Bxc7#
    • 1...Se3
      • 2.Bxc7#
    • 1...Sa5
      • 2.Bxc7#
    • 1...Scd6
      • 2.Qg3#
    • 1...Sf2
      • 2.Bxc7#
    • 1...Sg3
      • 2.Bxc7#
    • 1...Sc5
      • 2.Bxc7#
    • 1...Sg5
      • 2.Bxc7#
    • 1...Sed6
      • 2.Qe3#
    • 1...Sf6
      • 2.Bxc7#
  • Tries
    • 1.Bxc7+?
      • 1...Scd6
        • 2.Bxd6#
        • 2.Qg3#
      • 1...Sed6
        • 2.Bxd6#
      • 1...Se5!
    • 1.Qxd2+?
      • 1...Ke5
        • 2.Re6#
      • 1...Scxd2
        • 2.Sd3#
      • 1...Se3
        • 2.Sd3#
        • 2.Bxc7#
      • 1...cxd2
        • 2.Sd3#
      • 1...Sexd2!
  • Keys
    • 1.Rg5!
      • threat
        • 2.Rxf5#
      • 1...Rxd3+
        • 2.Sxd3#
      • 1...Ke5
        • 2.Rxf5#
      • 1...Sxg5
        • 2.Bxc7#
      • 1...Se3
        • 2.Bxc7#
      • 1...Scd6
        • 2.Qg3#
      • 1...Sg3
        • 2.Bxc7#
      • 1...Sed6
        • 2.Qe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 6
  • Sets
    • R(a);CHECK,XQ(C)::S(A),XR(a)
    • S(c);N_GUARD,P_SPINS(d)::B(G),XP(h)
    • S(c);N_PINQ(C),P_SPINS(d)::QAB1(C)
    • S(d);N_GUARD,P_SPINS(c)::B(G),XP(h)
    • S(d);N_PINQ(C),P_SPINS(c)::QAB1(C)
  • Tries
    • Try
      • B(G);CHECK,XP(h)
      • Vars
        • S(d);N_GUARD,N_PINQ(C),P_SPINS(c)::B(G),XS(d)
      • Refutation
        • S(c);P_SPINS(d)
    • Try
      • Q(C);CHECK,N_SPINQ(C),XR(a)
      • Vars
        • K(e);S_FLIGHT::R1(H)
        • S(c);P_SPINS(d),XQ(C)::S(A)
        • P(b);XQ(C)::S(A)
      • Refutation
        • S(d);P_SPINS(c),XQ(C)
  • Actual
    • R(H);
    • Threat
      • R1(H),XP(f)
    • Vars
      • R(a);CHECK,XQ(C)::S(A),XR(a)
      • K(e);P_SPINP(f),S_FLIGHT::R1(H),XP(f)
      • S(d);N_GUARD,P_SPINS(c),XR(H)::B(G),XP(h)
      • S(c);N_GUARD,P_SPINS(d)::B(G),XP(h)
      • S(c);N_PINQ(C),P_SPINS(d)::QAB1(C)
      • S(d);N_GUARD,P_SPINS(c)::B(G),XP(h)
      • S(d);N_PINQ(C),P_SPINS(c)::QAB1(C)
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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).