MESON Chess Problem Database

Problem Display
PID: 137887 (7b/8/KQRP1Bb1/8/P1NP4/P1kq1P1R/nNrpp3/2r5 w - - 0 1)

Ellerman, Arnoldo

3rd HM., L'Italia Scacchistica, 1927

7b/8/KQRP1Bb1/8/P1NP4/P1kq1P1R/nNrpp3/2r5

#2

12 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc4+
      • 2.Rxc4#
    • 1...Qe4
      • 2.fxe4#
    • 1...Qf5
      • 2.Se5#
    • 1...Qe3
      • 2.Sxe3#
      • 2.Sa5#
      • 2.Se5#
    • 1...Qxf3
      • 2.Sa5#
      • 2.Se5#
    • 1...Qxd4
      • 2.Se3#
      • 2.Sa5#
    • 1...Rxb2
      • 2.Qxb2#
    • 1...Sb4+
      • 2.Qxb4#
  • Tries
    • 1.Qa5+?
      • 1...Sb4+
        • 2.Qxb4#
      • 1...Kb3!
    • 1.d5+?
      • 1...Qd4
        • 2.Se3#
        • 2.Sa5#
      • 1...Bxf6!
  • Keys
    • 1.a5!
      • threat
        • 2.Sa4#
      • 1...Qxc4+
        • 2.Rxc4#
      • 1...Sb4+
        • 2.Qxb4#
      • 1...Qxf3
        • 2.Se5#
      • 1...Qxd4
        • 2.Se3#
      • 1...Rxb2
        • 2.Qxb2#
      • 1...Qe4
        • 2.fxe4#
      • 1...Qf5
        • 2.Se5#
      • 1...Qe3
        • 2.Sxe3#
        • 2.Se5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(g);CHECK,OGATE,P_SPINQ(g),XS(F)::R1(J),XQ(g)
    • Q(g);N_PINS(F),OGATE::R(D)+P(C),XQ(g)
    • Q(g);N_PINS(F)::R(J)+S(F)
    • R(c);OGATE,XS(A)::QAB1(I),XR(c)
    • S(b);CHECK,N_GUARD::QAB1(I),XS(b)
  • Tries
    • Try
      • Q(I);CHECK
      • Vars
        • S(b);CHECK,N_GUARD,P_SPINS(b)::QAB1(I),XS(b)
      • Refutation
        • K(f);P-FLIGHT
    • Try
      • P(G);CHECK
      • Refutation
        • B(i);XB(L)
  • Actual
    • P(E);
    • Threat
      • S(A)
    • Vars
      • Q(g);CHECK,OGATE,P_SPINQ(g),XS(F)::R1(J),XQ(g)
      • S(b);CHECK,N_GUARD::QAB1(I),XS(b)
      • Q(g);N_PINS(F),P_SPINQ(g),XP(C)::R(J)+S(F)
      • Q(g);N_PINS(F),P_SPINQ(g),XP(G)::R(J)+S(F)
      • R(c);OGATE,XS(A)::QAB1(I),XR(c)
      • Q(g);N_PINS(F),OGATE::R(D)+P(C),XQ(g)
      • Q(g);N_PINS(F)::R(J)+S(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).