MESON Chess Problem Database

Problem Display
PID: 201413 (2b4K/4RQ2/8/4Np1N/Rqr1kP2/8/B3P3/b5B1 w - - 0 1)

Ellerman, Arnoldo

L'Italia Scacchistica, 1922

2b4K/4RQ2/8/4Np1N/Rqr1kP2/8/B3P3/b5B1

#2

10 + 6

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qa5
      • 2.Bb1#
    • 1...Qc5
      • 2.Bb1#
    • 1...Qxe7
      • 2.Bb1#
    • 1...Qb1
      • 2.Bxb1#
    • 1...Rc1
      • 2.Bd5#
      • 2.Qd5#
    • 1...Rc2
      • 2.Bd5#
      • 2.Qd5#
    • 1...Rc3
      • 2.Sd7#
      • 2.Bd5#
      • 2.Qd5#
    • 1...Rc6
      • 2.Bd5#
      • 2.Qd5#
    • 1...Rc7
      • 2.Bd5#
      • 2.Qd5#
    • 1...Bxe5+
      • 2.Rxe5#
  • Tries
    • 1.Bb1+?
      • 1...Rc2
        • 2.Bxc2#
      • 1...Qxb1!
    • 1.Qxc4+?
      • 1...Bd4
        • 2.Qd3#
        • 2.Qd5#
        • 2.Qc2#
        • 2.Qc6#
      • 1...Qxc4!
    • 1.e3?
      • threat
        • 2.Sg3#
        • 2.Sf6#
      • 1...Qxe7
        • 2.Sg3#
        • 2.Bb1#
      • 1...Be6
        • 2.Sf6#
      • 1...Qe1
        • 2.Sf6#
      • 1...Qd6
        • 2.Sg3#
      • 1...Qb6
        • 2.Sg3#
      • 1...Rc6
        • 2.Sg3#
        • 2.Bd5#
        • 2.Qd5#
      • 1...Bxe5+!
  • Keys
    • 1.Qg6!
      • threat
        • 2.Qg2#
      • 1...Bxe5+
        • 2.Rxe5#
      • 1...Kd5
        • 2.Qc6#
      • 1...Qa3
        • 2.Qc6#
      • 1...Qc3
        • 2.Qc6#
      • 1...Qb3
        • 2.Qc6#
      • 1...Rc3
        • 2.Sd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 4
  • Sets
    • Q(b);N_GUARD,P_SPINR(c)::B(B)
    • Q(b);N_GUARD,P_SPINR(c),XR(H)::B(B)
    • Q(b);N_GUARD,P_SPINR(c)::B(B),XQ(b)
    • B(a);CHECK,OGATE,P_SPINB(a),XS(F)::R1(H),XB(a)
  • Tries
    • Try
      • B(B);CHECK
      • Vars
        • R(c);N_GUARD,P_SPINQ(b),P_SPINR(c)::B(B),XR(c)
      • Refutation
        • Q(b);P_SPINR(c),XB(B)
    • Try
      • Q(I);CHECK,XR(c)
      • Refutation
        • Q(b);P_SPINQ(b),XQ(I)
    • Try
      • P(C);
      • Threat
        • DUALS(2)
      • Vars
        • B(f);::S(G)
        • Q(b);P_SPINR(c)::S(G)
      • Refutation
        • B(a);CHECK,P_SPINB(a),XS(F)
  • Actual
    • Q(I);P_PINP(e)
    • Threat
      • QAB(I)
    • Vars
      • B(a);CHECK,OGATE,P_SPINB(a),XS(F)::R1(H),XB(a)
      • K(d);N_SPINP(e),P_SPINR(c),S_FLIGHT::QAB1(I)
      • Q(b);P_SPINR(c)::QAB(I)
      • R(c);N_PINS(F),P_SPINQ(b)::R(H)+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).