MESON Chess Problem Database

Problem Display
PID: 83544 (K5Q1/5P2/8/2R3N1/4p3/3knn1R/1B2rP1b/1N1B3b w - - 0 1)

Ellerman, Arnoldo

Good Companions, 1920

K5Q1/5P2/8/2R3N1/4p3/3knn1R/1B2rP1b/1N1B3b

#2

10 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sc4
      • 2.Rd5#
    • 1...Sd2
      • 2.Bc2#
    • 1...Sd4
      • 2.Rc3#
  • Tries
    • 1.Qd8+?
      • 1...Sd5
        • 2.Qxd5#
      • 1...Sd4
        • 2.Rc3#
        • 2.Qxd4#
      • 1...Bd6!
  • Keys
    • 1.Qg6!
      • threat
        • 2.Qxe4#
      • 1...Sxd1
        • 2.Qa6#
      • 1...Sxg5
        • 2.Qa6#
      • 1...Sf1
        • 2.Qa6#
      • 1...Sc2
        • 2.Qa6#
      • 1...Sg2
        • 2.Qa6#
      • 1...Sc4
        • 2.Rd5#
      • 1...Sg4
        • 2.Qa6#
      • 1...Sd5
        • 2.Qa6#
      • 1...Sf5
        • 2.Qa6#
      • 1...Se1
        • 2.Qa6#
      • 1...Sg1
        • 2.Qa6#
      • 1...Sd2
        • 2.Bc2#
      • 1...Sd4
        • 2.Rc3#
      • 1...Sh4
        • 2.Qa6#
      • 1...Se5
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 12
    • REMOVED MATES = 0
  • Sets
    • S(e);N_GUARD,P_SPINS(f),SBLOCK::R(F)
    • S(f);P_SPINS(e),S_CUTR(b)::B(B)
    • S(f);P_SPINS(e),SBLOCK::R1(F)
  • Tries
    • Try
      • Q(J);CHECK
      • Vars
        • S(e);N_GUARD,P_SPINS(f)::QAR2(J),XS(e)
      • Refutation
        • B(c);P_SPINB(c)
  • Actual
    • Q(J);P_PINP(g)
    • Threat
      • QAB1(J),XP(g)
    • Vars
      • S(e);N_GUARD,P_SPINS(f),XB(B)::QAB(J)
      • S(f);P_SPINS(e),XS(G)::QAB(J)
      • S(e);N_GUARD,P_SPINS(f)::QAB(J)
      • S(e);N_GUARD,P_SPINS(f),SBLOCK::R(F)
      • S(e);N_GUARD,N_SPINP(g),P_SPINS(f)::QAB(J)
      • S(f);P_SPINS(e)::QAB(J)
      • S(f);P_SPINS(e),S_CUTR(b)::B(B)
      • S(f);P_SPINS(e),SBLOCK::R1(F)
      • S(f);N_GUARD,P_SPINS(e),S_CUTB(c)::QAR(J)
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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).