MESON Chess Problem Database

Problem Display
PID: 163448 (2b5/n2rb3/p2N3p/P1k1BQ1r/1N4p1/P2K4/B2P1P1p/n7 w - - 0 1)

Ellerman, Arnoldo

The Observer, 1925

(First published on Sun Jul 19 1925)

2b5/n2rb3/p2N3p/P1k1BQ1r/1N4p1/P2K4/B2P1P1p/n7

#2

10 + 11

15239 Valois Notebooks 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Rh3+
      • 2.Bg3#
    • 1...Rh4
      • 2.Bxh2#
      • 2.Bg3#
      • 2.Bf4#
    • 1...Rxd6+
      • 2.Bd4#
    • 1...Bg5
      • 2.Bxh2#
      • 2.Bg3#
      • 2.Bf4#
    • 1...Bxd6
      • 2.Bd4#
  • Tries
    • 1.Sxa6+?
      • 1...Kc6
        • 2.Qe4#
      • 1...Bxa6+!
  • Keys
    • 1.Ke3!
      • threat
        • 2.d4#
      • 1...Rh3+
        • 2.Bg3#
      • 1...Bg5+
        • 2.Bf4#
      • 1...Sc2+
        • 2.Qxc2#
      • 1...Rxd6
        • 2.Bd4#
      • 1...Bxd6
        • 2.Bd4#
      • 1...Sb3
        • 2.Qc2#
      • 1...Sb5
        • 2.Se4#
      • 1...Sc6
        • 2.Sd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • R(e);CHECK,N_GUARD::QAR(I)+B(H)
    • R(i);CHECK,SBLOCK,XS(J)::QAR(I)+B(H),DCHECK
    • B(j);SBLOCK,XS(J)::QAR(I)+B(H),DCHECK
  • Tries
    • Try
      • S(F);CHECK,XP(f)
      • Vars
        • K(d);P-FLIGHT::QAB(I)
      • Refutation
        • B(k);CHECK,XS(F)
  • Actual
    • K(E);N_SPINS(J),P-FLIGHT
    • Threat
      • P(B)
    • Vars
      • R(e);CHECK,N_GUARD::QAR(I)+B(H)
      • B(j);CHECK,S_CUTR(e)::QAR(I)+B(H)
      • S(a);CHECK,N_GUARD::QAR(I),XS(a)
      • R(i);SBLOCK,XS(J)::QAR(I)+B(H),DCHECK
      • B(j);SBLOCK,XS(J)::QAR(I)+B(H),DCHECK
      • S(a);N_GUARD::QAR(I)
      • S(h);SBLOCK::S(J)
      • S(h);SBLOCK::S(F)
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