MESON Chess Problem Database

Problem Display
PID: 238713 (7Q/n1pR4/5p2/1b4p1/2N2N1n/2RKP1B1/8/3k4 w - - 0 1)

Ellerman, Arnoldo

L'Italia Scacchistica, 1932

7Q/n1pR4/5p2/1b4p1/2N2N1n/2RKP1B1/8/3k4

#2

8 + 7

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ba4
      • 2.Sb2#
    • 1...Bxc4+
      • 2.Kxc4#
    • 1...Ba6
      • 2.Ke4#
    • 1...Bc6
      • 2.Sb2#
    • 1...Bxd7
      • 2.Sb2#
    • 1...Sf5
      • 2.Qh1#
    • 1...Sg6
      • 2.Qh1#
    • 1...c6
      • 2.Ke4#
  • Tries
    • 1.Ra3?
      • threat
        • 2.Ra1#
      • 1...Kc1
        • 2.Ra1#
      • 1...Bxc4+!
    • 1.Qxh4?
      • threat
        • 2.Qh1#
        • 2.Qg4#
      • 1...Bxc4+
        • 2.Kxc4#
      • 1...Bxd7
        • 2.Sb2#
        • 2.Qh1#
      • 1...gxf4
        • 2.Qh1#
      • 1...Bc6
        • 2.Sb2#
      • 1...g4
        • 2.Qh1#
        • 2.Qxg4#
      • 1...f5
        • 2.Qh1#
      • 1...gxh4!
    • 1.Qh5+?
      • 1...Sf3
        • 2.Qxf3#
      • 1...g4!
  • Keys
    • 1.Qa8!
      • threat
        • 2.Qh1#
      • 1...Bxc4+
        • 2.Kxc4#
      • 1...Sg2
        • 2.Qf3#
      • 1...Bc6
        • 2.Sb2#
      • 1...Sf3
        • 2.Qxf3#
      • 1...Sc6
        • 2.Qa1#
      • 1...c6
        • 2.Ke4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • B(c);N_PINS(E)::S(E)
    • B(c);CHECK,XS(E)::R(G)+K(B),XB(c)
    • B(c);N_GUARD::R(G)+K(B)
    • B(c);N_PINS(E),XR(G)::S(E)
    • S(b);OGATE::QAR(H)
    • P(g);S_CUTB(c)::R(G)+K(B)
  • Tries
    • Try
      • R(A);
      • Threat
        • R(A)
      • Vars
        • K(a);P-FLIGHT::R(A)
      • Refutation
        • B(c);CHECK,XS(E)
    • Try
      • Q(H);XS(b)
      • Threat
        • DUALS(2)
      • Vars
        • B(c);CHECK,XS(E)::R(G)+K(B),XB(c)
        • P(d);XS(F)::QAR(H)
        • B(c);N_PINS(E)::S(E)
        • P(e);::QAR(H)
      • Refutation
        • P(d);XQ(H)
    • Try
      • Q(H);CHECK
      • Vars
        • S(b);N_GUARD,P_SPINS(b)::QAB(H),XS(b)
      • Refutation
        • P(d);P_SPINP(d)
  • Actual
    • Q(H);
    • Threat
      • QAR(H)
    • Vars
      • B(c);CHECK,XS(E)::R(G)+K(B),XB(c)
      • S(b);N_GUARD::QAB(H)
      • B(c);N_PINS(E)::S(E)
      • S(b);N_GUARD::QAB(H),XS(b)
      • S(f);OGATE::QAR(H)
      • P(g);S_CUTB(c)::R(G)+K(B)
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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).