MESON Chess Problem Database

Problem Display
PID: 202884 (3B4/pKR5/N2ppq2/kn1n3R/P7/rBN5/P6r/4Qb2 w - - 0 1)

Ellerman, Arnoldo

Western Daily Mercury, 1920

(First published on Fri Jan 30 1920)

3B4/pKR5/N2ppq2/kn1n3R/P7/rBN5/P6r/4Qb2

#2

10 + 10

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sbxc3
      • 2.Rc5#
      • 2.Re7#
    • 1...Sd4
      • 2.Se2#
      • 2.Rc5#
      • 2.Re7#
    • 1...Sbxc7
      • 2.Bxc7#
    • 1...Sdxc3
      • 2.Re7#
    • 1...Se3
      • 2.Re7#
    • 1...Sb4
      • 2.Re7#
    • 1...Sf4
      • 2.Re7#
    • 1...Sdxc7
      • 2.Bxc7#
    • 1...Se7
      • 2.Rc4#
      • 2.Rcc5#
      • 2.Rc6#
      • 2.Rd7#
      • 2.Rxe7#
      • 2.Rc8#
  • Tries
    • 1.Se2+?
      • 1...Sbc3
        • 2.Rc5#
        • 2.Re7#
      • 1...Sdc3
        • 2.Rxb5#
        • 2.Re7#
      • 1...Sb4
        • 2.Rxb5#
        • 2.Re7#
        • 2.Qxb4#
      • 1...Qc3!
    • 1.Sxd5+?
      • 1...Qc3
        • 2.Rc5#
      • 1...Sc3
        • 2.Rc5#
        • 2.Re7#
      • 1...Rd2!
    • 1.Sb4?
      • threat
        • 2.Sc6#
      • 1...Kxb4
        • 2.Sxd5#
      • 1...Sxb4
        • 2.Re7#
      • 1...Se7
        • 2.Rc4#
      • 1...Sd4!
    • 1.Rc4+?
      • 1...Sbc7
        • 2.Bxc7#
      • 1...Sb6
        • 2.Rxb5#
      • 1...Sdc7
        • 2.Bxc7#
        • 2.Rxb5#
      • 1...Qxd8!
    • 1.Re7+?
      • 1...Sbc7
        • 2.Bxc7#
      • 1...Sdc7
        • 2.Bxc7#
      • 1...Sb6!
  • Keys
    • 1.Sb8!
      • threat
        • 2.Sc6#
      • 1...Kb4
        • 2.Sxd5#
      • 1...Sd4
        • 2.Se2#
      • 1...Sb4
        • 2.Re7#
      • 1...Se7
        • 2.Rc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • S(e);OGATE,P_SPINS(f),XR(I)::B(J),XS(e)
    • S(f);N_GUARD,P_SPINS(f),S_CUTS(e),XS(D)::B(J)+R(I)
    • S(f);N_GUARD,P_SPINS(e)::B(J)+R(I)
    • S(f);OGATE,P_SPINS(e),XR(I)::B(J),XS(f)
  • Tries
    • Try
      • S(D);CHECK
      • Refutation
        • Q(i);P_SPINQ(i)
    • Try
      • S(D);CHECK,XS(f)
      • Vars
        • Q(i);P_SPINQ(i)::B(J)+R(I)
      • Refutation
        • R(b);P_SPINR(b)
    • Try
      • S(G);
      • Threat
        • S(G)
      • Vars
        • K(d);S_FLIGHT,XS(G)::QAB(A)+S(D),DCHECK,XS(f)
        • S(f);N_GUARD,P_SPINS(e),SBLOCK,XS(G)::B(J)+R(I)
        • S(f);N_GUARD,P_SPINS(e),S_CUTQ(i)::B(J)+R(I)
      • Refutation
        • S(e);P_SPINS(f)
    • Try
      • R(I);CHECK
      • Vars
        • S(e);N_GUARD,P_SPINS(f)::B(J),XS(e)
        • S(f);OGATE,P_SPINS(e)::R1(F),XS(e)
      • Refutation
        • Q(i);XB(J)
    • Try
      • R(I);CHECK
      • Vars
        • S(e);N_GUARD,P_SPINS(f)::B(J),XS(e)
        • S(f);N_GUARD,P_SPINS(e)::B(J),XS(f)
      • Refutation
        • S(f);P_SPINS(e)
  • Actual
    • S(G);
    • Threat
      • S(G)
    • Vars
      • K(d);S_FLIGHT::QAB(A)+S(D),DCHECK,XS(f)
      • S(e);N_GUARD,P_SPINS(f),S_CUTQ(i)::QAB(A)+S(D)
      • S(f);N_GUARD,P_SPINS(e),SBLOCK::B(J)+R(I)
      • S(f);N_GUARD,P_SPINS(e),S_CUTQ(i)::B(J)+R(I)
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