MESON Chess Problem Database

Problem Display
PID: 70988 (2nb2B1/8/1np1N3/1Npkp1Q1/1r2R2K/4p3/8/8 w - - 0 1)

Ellerman, Arnoldo

HM., Western Morning News, 1932

2nb2B1/8/1np1N3/1Npkp1Q1/1r2R2K/4p3/8/8

#2

6 + 9

136 Problem Observer 2013

SOLUTION

  • SOUND
  • Sets
    • 1...Rxe4+
      • 2.Sf4#
    • 1...Bxg5+
      • 2.Sxg5#
    • 1...Sd6
      • 2.Sc3#
    • 1...Se7
      • 2.Qxe5#
    • 1...c4
      • 2.Rd4#
      • 2.Rxe5#
  • Tries
    • 1.Qxd8+?
      • 1...Sd7
        • 2.Sg5#
      • 1...Sd6
        • 2.Sc3#
        • 2.Sg5#
      • 1...Kxe4!
  • Keys
    • 1.Qf6!
      • threat
        • 2.Sg5#
      • 1...Rxe4+
        • 2.Sf4#
      • 1...Kxe4
        • 2.Sxc5#
      • 1...Sd6
        • 2.Sc3#
      • 1...Se7
        • 2.Qxe5#
      • 1...c4
        • 2.Rxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • R(b);CHECK,SBLOCK,XR(A)::B(F)+S(E),DCHECK
    • B(i);CHECK,N_SPINP(e),XQ(D)::B(F)+S(E),XB(i)
    • S(h);SBLOCK::S(C)
    • S(h);N_PINQ(D)::QAR1(D),XP(e)
  • Tries
    • Try
      • Q(D);CHECK,N_PINP(e),N_SPINQ(D),XB(i)
      • Vars
        • S(f);P_SPINS(f)::B(F)+S(E)
      • Refutation
        • K(d);S_FLIGHT,XR(A)
  • Actual
    • Q(D);N_PINP(e)
    • Threat
      • B(F)+S(E)
    • Vars
      • R(b);CHECK,SBLOCK,XR(A)::B(F)+S(E),DCHECK
      • K(d);S_FLIGHT,XR(A)::S(E),XP(c)
      • S(h);SBLOCK::S(C)
      • S(h);N_PINQ(D)::QAR1(D),XP(e)
      • P(c);N_PINR(A),SBLOCK::R1(A),XP(e)
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