MESON Chess Problem Database

Problem Display
PID: 157761 (1K2B3/1n2Npr1/1p2pN2/2k5/4RB2/1pppRn2/2q5/6Q1 w - - 0 1)

Ellerman, Arnoldo

L'Italia Scacchistica, 1919

1K2B3/1n2Npr1/1p2pN2/2k5/4RB2/1pppRn2/2q5/6Q1

#2

8 + 11

15148 Sadier Collection 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Sd2
      • 2.Rg3#
    • 1...Sg5
      • 2.Re2#
    • 1...d2
      • 2.Rxc3#
    • 1...b5
      • 2.Sd7#
  • Tries
    • 1.Rxd3+?
      • 1...Qf2
        • 2.Rxc3#
      • 1...Sxg1
        • 2.Be3#
      • 1...Sd4
        • 2.Qxd4#
      • 1...Rxg1!
    • 1.Rxf3+?
      • 1...Qf2
        • 2.Qxf2#
      • 1...Rxg1!
  • Keys
    • 1.Ra4!
      • threat
        • 2.Se4#
      • 1...b5
        • 2.Sd7#
      • 1...Sd2
        • 2.Rg3#
      • 1...Sg5
        • 2.Re2#
      • 1...Sd6
        • 2.Re5#
      • 1...d2
        • 2.Rxc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • S(e);OGATE::QAB(A)+R(B)
    • S(e);N_GUARD,S_CUTR(k)::QAB(A)+R(B)
    • P(d);OGATE::QAB(A)+R(B),DCHECK,XP(c)
    • P(g);SBLOCK::S(E)
  • Tries
    • Try
      • R(B);CHECK,XP(d)
      • Vars
        • Q(a);P_SPINQ(a)::R(B),XP(c)
        • S(e);N_GUARD,XQ(A)::B(D)
        • S(e);N_GUARD,P_SPINS(e)::QAB1(A),XS(e)
      • Refutation
        • R(k);XQ(A)
    • Try
      • R(B);CHECK,XS(e)
      • Vars
        • Q(a);N_GUARD,P_SPINQ(a)::QAB(A),XQ(a)
      • Refutation
        • R(k);XQ(A)
  • Actual
    • R(C);
    • Threat
      • S(E)
    • Vars
      • P(g);SBLOCK::S(E)
      • S(e);OGATE::QAB(A)+R(B)
      • S(e);N_GUARD,S_CUTR(k)::QAB(A)+R(B)
      • S(i);SBLOCK::QAB(A)+R(B),DCHECK
      • P(d);OGATE::QAB(A)+R(B),DCHECK,XP(c)
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