MESON Chess Problem Database

Problem Display
PID: 139485 (2B5/3qP3/r3n1Q1/p5NP/R1P3kr/1p3RB1/3pP3/3Kb3 w - - 0 1)

Ellerman, Arnoldo

4th HM., Midweek Sports Referee, 1929

2B5/3qP3/r3n1Q1/p5NP/R1P3kr/1p3RB1/3pP3/3Kb3

#2

11 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qb5
      • 2.cxb5#
    • 1...Qd5
      • 2.cxd5#
    • 1...Qa7
      • 2.c5#
    • 1...Qxe7
      • 2.c5#
    • 1...Rh3
      • 2.Sxe6#
    • 1...Rxh5
      • 2.Qf5#
    • 1...Sc7
      • 2.c5#
    • 1...Sg7
      • 2.c5#
    • 1...Sd8
      • 2.c5#
    • 1...Sf8
      • 2.c5#
  • Tries
    • 1.c5+?
      • 1...Qd4
        • 2.Rxd4#
      • 1...Sd4
        • 2.Rxd4#
      • 1...Sf4
        • 2.Raxf4#
      • 1...Qxa4!
  • Keys
    • 1.Bf2!
      • threat
        • 2.Sxe6#
      • 1...Qxe7
        • 2.c5#
      • 1...Rxh5
        • 2.Qf5#
      • 1...Sxg5
        • 2.c5#
      • 1...Qb5
        • 2.cxb5#
      • 1...Qe8
        • 2.Sf7#
      • 1...Qd3
        • 2.Se4#
      • 1...Qd5
        • 2.cxd5#
      • 1...Sd4
        • 2.Se6#
      • 1...Sf4
        • 2.Rg3#
      • 1...Sc5
        • 2.Se6#
      • 1...Sc7
        • 2.Se6#
        • 2.c5#
      • 1...Sg7
        • 2.Se6#
        • 2.c5#
      • 1...Sd8
        • 2.Se6#
        • 2.c5#
      • 1...Sf8
        • 2.c5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 5
  • Sets
    • Q(i);OGATE,P_SPINS(h)::R(E)+P(F),XQ(i)
    • Q(i);N_GUARD,P_SPINS(h)::R(E)+P(F)
    • Q(i);N_GUARD,P_SPINS(h),XP(J)::R(E)+P(F)
    • R(e);SBLOCK::QAR(I)+S(G),XS(h)
    • R(e);SBLOCK,XP(H)::QAB1(I)
    • S(h);N_GUARD,P_SPINQ(i)::R(E)+P(F)
  • Tries
    • Try
      • P(F);CHECK
      • Vars
        • Q(i);N_GUARD,P_SPINQ(i),P_SPINS(h)::R(E),XQ(i)
        • S(h);N_GUARD,P_SPINQ(i),P_SPINS(h)::R(E),XS(h)
        • S(h);N_GUARD,P_SPINQ(i),P_SPINS(h)::R1(E),XS(h)
      • Refutation
        • Q(i);P_SPINS(h),XR(E)
  • Actual
    • B(D);
    • Threat
      • QAR(I)+S(G),XS(h)
    • Vars
      • Q(i);N_GUARD,P_SPINS(h),XP(J)::R(E)+P(F)
      • R(e);SBLOCK,XP(H)::QAB1(I)
      • S(h);N_GUARD,P_SPINQ(i),P_SPINS(h),XS(G)::R(E)+P(F)
      • Q(i);OGATE,P_SPINS(h)::R(E)+P(F),XQ(i)
      • Q(i);P_SPINS(h)::QAR(I)+S(G)
      • S(h);P_SPINQ(i)::QAR(I)+S(G)
      • S(h);P_SPINQ(i),SBLOCK::R1(C)
      • S(h);N_GUARD,P_SPINQ(i)::R(E)+P(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).