MESON Chess Problem Database

Problem Display
PID: 247605 (B3N2B/1r5Q/b2pP1R1/5N2/Rn2kPK1/qPb1p3/2P1p2p/8 w - - 0 1)

Easter, Norris

British Chess Magazine, 1932

B3N2B/1r5Q/b2pP1R1/5N2/Rn2kPK1/qPb1p3/2P1p2p/8

#2

12 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Be1
      • 2.Sf6#
    • 1...Bd2
      • 2.Sf6#
    • 1...Bf6
      • 2.Sxf6#
    • 1...h1Q
      • 2.Qxh1#
    • 1...h1S
      • 2.Qxh1#
    • 1...h1B
      • 2.Qxh1#
    • 1...h1R
      • 2.Qxh1#
    • 1...d5
      • 2.Sg3#
      • 2.Sfd6#
      • 2.Sed6#
  • Tries
    • 1.Bxb7+?
      • 1...d5
        • 2.Sg3#
        • 2.Sfd6#
        • 2.Sed6#
      • 1...Bxb7!
    • 1.Qxb7+?
      • 1...d5
        • 2.Sg3#
        • 2.Sfd6#
        • 2.Sed6#
        • 2.Qxd5#
      • 1...Bxb7!
  • Keys
    • 1.Sd4!
      • threat
        • 2.Rg5#
      • 1...Kd5
        • 2.Rg5#
      • 1...h1Q
        • 2.Qxh1#
      • 1...h1R
        • 2.Qxh1#
      • 1...Sd5
        • 2.Rg7#
      • 1...Sc6
        • 2.Sf6#
      • 1...d5
        • 2.Sd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • B(d);N_GUARD::S(K)
    • B(d);N_GUARD::S(K),XB(d)
    • P(b);OGATE::QAB(I),XQ(b)
    • P(b);OGATE::QAB(I),XS(b)
    • P(b);OGATE::QAB(I),XB(b)
    • P(b);OGATE::QAB(I),XR(b)
  • Tries
    • Try
      • B(J);CHECK,XR(j)
      • Refutation
        • B(h);XB(J)
    • Try
      • Q(I);CHECK,XR(j)
      • Refutation
        • B(h);P_SPINB(h),XQ(I)
  • Actual
    • S(F);N_PINS(f)
    • Threat
      • QAB(I)+R(H)
    • Vars
      • K(g);S_FLIGHT::R(H)
      • P(b);OGATE::QAB(I),XQ(b)
      • P(b);OGATE::QAB(I),XR(b)
      • S(f);N_SPINR(j),SBLOCK::QAB(I)+R(H)
      • S(f);N_SPINR(j)::S(K)
      • P(i);N_SPINR(j),SBLOCK::S(K)
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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).