MESON Chess Problem Database

Problem Display
PID: 198157 (n4K2/8/2p3p1/1Q1N2Pb/R2NkB2/2P1n2B/2PPqb2/3rR3 w - - 0 1)

Ellerman, Arnoldo

L'Italia Scacchistica, 1920

n4K2/8/2p3p1/1Q1N2Pb/R2NkB2/2P1n2B/2PPqb2/3rR3

#2

12 + 9

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qd3
      • 2.cxd3#
    • 1...Qf3
      • 2.Sb3#
      • 2.Sf5#
      • 2.Sxc6#
      • 2.Se6#
    • 1...Sg4
      • 2.Bg2#
  • Tries
    • 1.Bh2?
      • threat
        • 2.Sf6#
      • 1...Qf3+
        • 2.Sf5#
      • 1...Sxd5
        • 2.Qd3#
      • 1...cxd5
        • 2.Qe8#
      • 1...Sg4
        • 2.Bg2#
      • 1...Bg3!
    • 1.Bg3?
      • threat
        • 2.Sf6#
      • 1...Qf3+
        • 2.Sf5#
      • 1...Sxd5
        • 2.Qd3#
      • 1...cxd5
        • 2.Qe8#
      • 1...Sg4
        • 2.Bg2#
      • 1...Bxg3!
    • 1.Bc7?
      • threat
        • 2.Sf6#
      • 1...Qf3+
        • 2.Sf5#
      • 1...Sxd5
        • 2.Qd3#
      • 1...cxd5
        • 2.Qe8#
      • 1...Sg4
        • 2.Bg2#
      • 1...Sxc7!
    • 1.Bb8?
      • threat
        • 2.Sf6#
      • 1...Qf3+
        • 2.Sf5#
      • 1...Sxd5
        • 2.Qd3#
      • 1...cxd5
        • 2.Qe8#
      • 1...Sg4
        • 2.Bg2#
      • 1...Sc7!
  • Keys
    • 1.Bd6!
      • threat
        • 2.Sf6#
      • 1...Qf3+
        • 2.Sf5#
      • 1...Sxd5
        • 2.Qd3#
      • 1...cxd5
        • 2.Qe8#
      • 1...Sg4
        • 2.Bg2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • Q(b);OGATE,P_SPINS(d)::P(B),XQ(b)
    • S(d);N_GUARD,P_SPINQ(b),S_CUTB(f)::B(E)
  • Tries
    • Try
      • B(H);
      • Threat
        • S(J)
      • Vars
        • Q(b);CHECK,N_GUARD,P_SPINS(d),SBLOCK::R(F)+S(G)
        • S(d);P_SPINQ(b),SBLOCK,XS(J)::QAB1(I)
        • P(g);OGATE,SBLOCK,XS(J)::QAR(I)
        • S(d);N_GUARD,P_SPINQ(b),S_CUTB(f)::B(E)
      • Refutation
        • B(c);
    • Try
      • B(H);
      • Threat
        • S(J)
      • Vars
        • Q(b);CHECK,N_GUARD,P_SPINS(d),SBLOCK::R(F)+S(G)
        • S(d);P_SPINQ(b),SBLOCK,XS(J)::QAB1(I)
        • P(g);OGATE,SBLOCK,XS(J)::QAR(I)
        • S(d);N_GUARD,P_SPINQ(b),S_CUTB(f)::B(E)
      • Refutation
        • B(c);XB(H)
    • Try
      • B(H);
      • Threat
        • S(J)
      • Vars
        • Q(b);CHECK,N_GUARD,P_SPINS(d),SBLOCK::R(F)+S(G)
        • S(d);P_SPINQ(b),SBLOCK,XS(J)::QAB1(I)
        • P(g);OGATE,SBLOCK,XS(J)::QAR(I)
        • S(d);N_GUARD,P_SPINQ(b),S_CUTB(f)::B(E)
      • Refutation
        • S(i);XB(H)
    • Try
      • B(H);
      • Threat
        • S(J)
      • Vars
        • Q(b);CHECK,N_GUARD,P_SPINS(d),SBLOCK::R(F)+S(G)
        • S(d);P_SPINQ(b),SBLOCK,XS(J)::QAB1(I)
        • P(g);OGATE,SBLOCK,XS(J)::QAR(I)
        • S(d);N_GUARD,P_SPINQ(b),S_CUTB(f)::B(E)
      • Refutation
        • S(i);
  • Actual
    • B(H);
    • Threat
      • S(J)
    • Vars
      • Q(b);CHECK,N_GUARD,P_SPINS(d),SBLOCK::R(F)+S(G)
      • S(d);P_SPINQ(b),SBLOCK,XS(J)::QAB1(I)
      • P(g);OGATE,SBLOCK,XS(J)::QAR(I)
      • S(d);N_GUARD,P_SPINQ(b),S_CUTB(f)::B(E)
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