MESON Chess Problem Database

Problem Display
PID: 146616 (4N1bq/1R6/8/pPknb1Rn/4Q1r1/1P1B2P1/5Np1/B5K1 w - - 0 1)

Ellerman, Arnoldo

3rd HM., Good Companions (February), 1918

4N1bq/1R6/8/pPknb1Rn/4Q1r1/1P1B2P1/5Np1/B5K1

#2

11 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rxg3
      • 2.Qc4#
    • 1...Rxg5
      • 2.Qc4#
    • 1...Bd4
      • 2.Qe7#
    • 1...Bf4
      • 2.Qc4#
    • 1...Bg7
      • 2.Qe7#
    • 1...Sb4
      • 2.Bd4#
    • 1...Sdf4
      • 2.Qd4#
    • 1...Sb6
      • 2.Rc7#
    • 1...Shf4
      • 2.Qc4#
  • Tries
    • 1.Bd4+?
      • 1...Bxd4
        • 2.Qe7#
      • 1...Kb4!
    • 1.Bb1?
      • threat
        • 2.Sd3#
      • 1...Rxg3
        • 2.Qc4#
      • 1...Bd4
        • 2.Qe7#
      • 1...Sb4
        • 2.Bd4#
      • 1...Sdf4
        • 2.Qd4#
      • 1...Shf4
        • 2.Qc4#
      • 1...Sb6!
    • 1.Bc2?
      • threat
        • 2.Sd3#
      • 1...Rxg3
        • 2.Qc4#
      • 1...Bd4
        • 2.Qe7#
      • 1...Sb4
        • 2.Bd4#
      • 1...Sdf4
        • 2.Qd4#
      • 1...Shf4
        • 2.Qc4#
      • 1...Sb6!
    • 1.b4+?
      • 1...Sxb4
        • 2.Bd4#
      • 1...axb4!
  • Keys
    • 1.Be2!
      • threat
        • 2.Sd3#
      • 1...Rxg3
        • 2.Qc4#
      • 1...Bd4
        • 2.Qe7#
      • 1...Sb4
        • 2.Bd4#
      • 1...Sdf4
        • 2.Qd4#
      • 1...Sb6
        • 2.Rc7#
      • 1...Shf4
        • 2.Qc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 3
  • Sets
    • R(b);N_GUARD,XP(F)::QAR1(G)
    • R(b);N_GUARD,XR(I)::QAR1(G)
    • B(f);OGATE,P_PINS(C),P_SPINS(e)::QAB(G)
    • B(f);P_SPINS(e),S_CUTR(b)::QAR1(G)
    • B(f);OGATE,P_SPINS(e)::QAB(G)
    • S(e);P_SPINB(f),SBLOCK::B(A)
    • S(e);P_SPINB(f),S_CUTR(b)::QAB1(G)
    • S(e);N_GUARD,P_SPINB(f),SBLOCK::R(J)
    • S(g);S_CUTR(b)::QAR1(G)
  • Tries
    • Try
      • B(A);CHECK
      • Vars
        • B(f);OGATE,P_PINS(C),P_SPINS(e),SBLOCK,XB(A)::QAB(G)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • B(E);
      • Threat
        • S(C)
      • Vars
        • R(b);N_GUARD,XP(F)::QAR1(G)
        • B(f);OGATE,P_PINS(C),P_SPINS(e)::QAB(G)
        • S(e);P_SPINB(f),SBLOCK::B(A)
        • S(e);P_SPINB(f),S_CUTR(b)::QAB1(G)
        • S(g);S_CUTR(b)::QAR1(G)
      • Refutation
        • S(e);P_SPINB(f)
    • Try
      • B(E);
      • Threat
        • S(C)
      • Vars
        • R(b);N_GUARD,XP(F)::QAR1(G)
        • B(f);OGATE,P_PINS(C),P_SPINS(e)::QAB(G)
        • S(e);P_SPINB(f),SBLOCK::B(A)
        • S(e);P_SPINB(f),S_CUTR(b)::QAB1(G)
        • S(g);S_CUTR(b)::QAR1(G)
      • Refutation
        • S(e);P_SPINB(f)
    • Try
      • P(D);CHECK
      • Vars
        • S(e);P_SPINB(f),SBLOCK,XP(D)::B(A)
      • Refutation
        • P(c);XP(D)
  • Actual
    • B(E);
    • Threat
      • S(C)
    • Vars
      • R(b);N_GUARD,XP(F)::QAR1(G)
      • B(f);OGATE,P_PINS(C),P_SPINS(e)::QAB(G)
      • S(e);P_SPINB(f),SBLOCK::B(A)
      • S(e);P_SPINB(f),S_CUTR(b)::QAB1(G)
      • S(e);N_GUARD,P_SPINB(f),SBLOCK::R(J)
      • S(g);S_CUTR(b)::QAR1(G)
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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).