MESON Chess Problem Database

Problem Display
PID: 181234 (n2R4/B3p3/1q1p2K1/3B4/1PPkpNR1/1n1N1p2/2bP1P2/b6Q w - - 0 1)

Robinson, Frank

1st Prize, Sydney Morning Herald, 1909

n2R4/B3p3/1q1p2K1/3B4/1PPkpNR1/1n1N1p2/2bP1P2/b6Q

#2

12 + 10

15 British Chess Magazine 1911
937 Sunday Referee 1928

SOLUTION

  • SOUND
  • Sets
    • 1...Sxd2
      • 2.Qxa1#
    • 1...Sa5
      • 2.Qxa1#
    • 1...Sc5
      • 2.Qxa1#
    • 1...e3
      • 2.fxe3#
  • Tries
    • 1.Se2+?
      • 1...fxe2
        • 2.Qxe4#
      • 1...Kxd3!
    • 1.Bxb6+?
      • 1...Sc5
        • 2.Qxa1#
      • 1...Sxb6!
    • 1.Qe1?
      • threat
        • 2.Qe3#
        • 2.Qxe4#
      • 1...Sxd2
        • 2.Qxa1#
      • 1...exd3
        • 2.Sg2#
        • 2.Sh3#
        • 2.Sh5#
        • 2.Se6#
        • 2.Qe3#
        • 2.Qe4#
      • 1...Sc5
        • 2.Qxa1#
        • 2.Qe3#
      • 1...e3
        • 2.Qxe3#
        • 2.dxe3#
        • 2.fxe3#
      • 1...Bxd3!
  • Keys
    • 1.Se5!
      • threat
        • 2.Sc6#
      • 1...e3+
        • 2.Sfd3#
      • 1...dxe5+
        • 2.Be6#
      • 1...Kxe5
        • 2.Qh8#
      • 1...Sxd2
        • 2.Qxa1#
      • 1...Sa5
        • 2.Qxa1#
      • 1...Sc5
        • 2.Qxa1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(c);N_GUARD,XP(B)::QAB(A),XB(a)
    • S(c);N_GUARD::QAB(A),XB(a)
    • S(c);N_GUARD,N_SPINQ(g)::QAB(A),XB(a)
    • P(f);OGATE,P_PINS(D)::P(C),XP(f)
  • Tries
    • Try
      • S(G);CHECK,P_PINP(f)
      • Vars
        • P(d);OGATE,XS(G)::QAR1(A),XP(f)
      • Refutation
        • K(e);N_SPINP(f),N_SPINQ(g),P-FLIGHT,XS(D)
    • Try
      • B(K);CHECK,XQ(g)
      • Vars
        • S(c);P_SPINS(c)::QAB(A),XB(a)
      • Refutation
        • S(j);XB(K)
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(c);N_GUARD,XP(B)::QAB(A),XB(a)
      • Refutation
        • B(b);XS(D)
  • Actual
    • S(D);
    • Threat
      • S(D)
    • Vars
      • P(f);CHECK::R(H)+S(G)
      • P(h);CHECK,OGATEB,SBLOCK,XS(D)::R(L)+B(I)
      • K(e);N_SPINQ(g),OGATEB,S_FLIGHT,XS(D)::QAB(A)
      • S(c);N_GUARD,XP(B)::QAB(A),XB(a)
      • S(c);N_GUARD::QAB(A),XB(a)
      • S(c);N_GUARD,N_SPINQ(g)::QAB(A),XB(a)
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