MESON Chess Problem Database

Problem Display
PID: 137898 (b1R3B1/5r2/2n5/Q2r3q/2kN1Rp1/P3P1p1/1PP1N3/2nKb3 w - - 0 1)

Ellerman, Arnoldo

HM., L'Italia Scacchistica, 1927

b1R3B1/5r2/2n5/Q2r3q/2kN1Rp1/P3P1p1/1PP1N3/2nKb3

#2

11 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd4+
      • 2.Rxd4#
    • 1...Rdf5
      • 2.Sxf5#
    • 1...Rg5
      • 2.Sb3#
      • 2.Sf3#
      • 2.Sf5#
      • 2.Sxc6#
    • 1...Rxf4
      • 2.Qb5#
    • 1...Rff5
      • 2.Qb5#
    • 1...Rf6
      • 2.Qb5#
    • 1...Ra7
      • 2.Qb5#
    • 1...Rb7
      • 2.Rxc6#
    • 1...Rc7
      • 2.Qb5#
    • 1...Rd7
      • 2.Qb5#
    • 1...Re7
      • 2.Qb5#
    • 1...Rg7
      • 2.Qb5#
    • 1...Rh7
      • 2.Qb5#
    • 1...Rf8
      • 2.Qb5#
    • 1...Bf2
      • 2.Qc3#
      • 2.Qb4#
    • 1...Bc3
      • 2.Qxc3#
    • 1...Bb4
      • 2.Qxb4#
    • 1...Sa2
      • 2.b3#
    • 1...Sxe2
      • 2.b3#
    • 1...Sd3
      • 2.b3#
  • Tries
    • 1.Qa4+?
      • 1...Bb4
        • 2.Qxb4#
      • 1...Kc5!
  • Keys
    • 1.Sc3!
      • threat
        • 2.Qb4#
      • 1...Rxd4+
        • 2.Rxd4#
      • 1...Rxa5
        • 2.Sb3#
      • 1...Bxc3
        • 2.Qxc3#
      • 1...Rb5
        • 2.Sb3#
      • 1...Rc5
        • 2.Sxc6#
      • 1...Rb7
        • 2.Rxc6#
      • 1...Rc7
        • 2.Qb5#
      • 1...Sa2
        • 2.b3#
      • 1...Sd3
        • 2.b3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 12
  • Sets
    • R(f);CHECK,OGATE,P_SPINR(f),XS(G)::R1(H),XR(f)
    • R(f);N_PINS(G),P_SPINR(i)::R(H)+S(G),XR(f)
    • R(i);P_SPINR(f),XR(H)::QAB1(I)
    • R(i);P_SPINR(f)::QAB1(I)
    • R(i);P_SPINR(f),S_CUTB(j)::R(J),XS(h)
    • R(i);N_SPINS(h),P_SPINR(f)::QAB1(I)
    • B(b);N_GUARD::QAR1(I),XB(b)
    • S(a);N_GUARD::P(B)
    • S(a);N_GUARD,XS(D)::P(B)
    • S(a);N_GUARD,N_PINS(G)::P(B)
  • Tries
    • Try
      • Q(I);CHECK
      • Vars
        • B(b);N_GUARD,P_SPINB(b)::QAR1(I),XB(b)
      • Refutation
        • K(d);P-FLIGHT
  • Actual
    • S(D);
    • Threat
      • QAR1(I)
    • Vars
      • R(f);CHECK,OGATE,P_SPINR(f),XS(G)::R1(H),XR(f)
      • R(f);N_PINS(G),P_SPINR(i),XQ(I)::R(H)+S(G)
      • B(b);OGATE,XS(D)::QAR1(I),XB(b)
      • R(f);N_PINS(G),P_SPINR(i)::R(H)+S(G)
      • R(f);N_PINS(G),N_SPINS(h),P_SPINR(i)::R(H)+S(G),XS(h)
      • R(i);P_SPINR(f),S_CUTB(j)::R(J),XS(h)
      • R(i);N_SPINS(h),P_SPINR(f)::QAB1(I)
      • S(a);N_GUARD::P(B)
      • S(a);N_GUARD,N_PINS(G)::P(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).