MESON Chess Problem Database

Problem Display
PID: 66865 (K4R1B/2NQ4/2P1p3/2p3p1/R1bnkp2/1p4r1/3P2P1/2r1N1b1 w - - 0 1)

Ellerman, Arnoldo

Chess, 1947

K4R1B/2NQ4/2P1p3/2p3p1/R1bnkp2/1p4r1/3P2P1/2r1N1b1

#2

10 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Bf1
      • 2.Qxe6#
      • 2.Qh7#
    • 1...Be2
      • 2.Qxe6#
      • 2.Qh7#
    • 1...Bd3
      • 2.Qxe6#
      • 2.Qh7#
    • 1...Bb5
      • 2.Qxe6#
      • 2.Qh7#
    • 1...Bd5
      • 2.Qh7#
    • 1...Ba6
      • 2.Qxe6#
      • 2.Qh7#
    • 1...Sc2
      • 2.Qxe6#
      • 2.Qh7#
    • 1...Se2
      • 2.Qxe6#
      • 2.Qh7#
    • 1...Sf3
      • 2.Qd3#
      • 2.Qh7#
    • 1...Sb5
      • 2.Qxe6#
      • 2.Qh7#
    • 1...Sf5
      • 2.Qxe6#
    • 1...Sxc6
      • 2.Qxc6#
      • 2.Qh7#
  • Tries
    • 1.Qd6?
      • threat
        • 2.Qe5#
      • 1...Sxc6
        • 2.Qxc6#
      • 1...Sf3
        • 2.Qd3#
      • 1...e5
        • 2.Qxe5#
      • 1...Rxe1!
    • 1.Qg7?
      • threat
        • 2.Qe5#
      • 1...Sxc6
        • 2.Qg6#
        • 2.Qh7#
      • 1...Sf3
        • 2.Qg6#
        • 2.Qh7#
      • 1...e5
        • 2.Qxe5#
      • 1...Rxe1!
  • Keys
    • 1.Sa6!
      • threat
        • 2.Sxc5#
      • 1...Bxa6
        • 2.Qxe6#
      • 1...Sxc6
        • 2.Qxc6#
      • 1...Bf1
        • 2.Qxe6#
      • 1...Be2
        • 2.Qxe6#
      • 1...Bd3
        • 2.Qxe6#
      • 1...Bb5
        • 2.Qxe6#
      • 1...Bd5
        • 2.Qh7#
      • 1...Sc2
        • 2.Qxe6#
      • 1...Se2
        • 2.Qxe6#
      • 1...Sf3
        • 2.Qd3#
      • 1...Sb5
        • 2.Qxe6#
      • 1...Sf5
        • 2.Qxe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 10
    • REMOVED MATES = 0
  • Sets
    • B(e);P_PINP(E),P_SPINS(f)::QAB(G)
    • S(f);N_GUARD,P_SPINB(e)::QAR2(G),XP(k)
  • Tries
    • Try
      • Q(G);
      • Threat
        • QAR1(G)
      • Vars
        • S(f);OGATE,P_SPINB(e),XP(E)::QAB(G),XS(f)
        • S(f);OGATE,P_SPINB(e)::QAB1(G)
        • P(k);::QAR1(G),XP(k)
      • Refutation
        • R(a);XS(A)
    • Try
      • Q(G);
      • Threat
        • QAR1(G)
      • Vars
        • P(k);::QAR1(G),XP(k)
      • Refutation
        • R(a);XS(A)
  • Actual
    • S(F);
    • Threat
      • S(F),XP(i)
    • Vars
      • B(e);N_GUARD,P_SPINS(f),XS(F)::QAR2(G),XP(k)
      • S(f);OGATE,P_SPINB(e),XP(E)::QAB(G),XS(f)
      • B(e);N_GUARD,P_SPINS(f)::QAR2(G),XP(k)
      • B(e);P_PINP(E),P_SPINS(f),SBLOCK::QAB(G)
      • S(f);N_GUARD,P_SPINB(e)::QAR2(G),XP(k)
      • S(f);OGATE,P_SPINB(e)::QAB1(G)
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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).