MESON Chess Problem Database

Problem Display
PID: 10427 (R7/1p2P3/1p1B4/P4P1p/k5qQ/1N1P4/2PP4/2KB4 w - - 0 1)

Barnes, Barry Peter

Problem (Zagreb), 1964

R7/1p2P3/1p1B4/P4P1p/k5qQ/1N1P4/2PP4/2KB4

#2

12 + 5

3174 The Two-move Chess Problem Tradition and Development 1966

SOLUTION

  • SOUND
  • Sets
    • 1...Kb5
      • 2.e8Q#
      • 2.e8B#
    • 1...Qb4
      • 2.Qxb4#
    • 1...Qc4
      • 2.Qxc4#
    • 1...bxa5
      • 2.Rxa5#
  • Tries
    • 1.Sa1?
      • 1...Kb5
        • 2.e8Q#
        • 2.e8B#
      • 1...Qxh4
        • 2.c4#
      • 1...Qb4
        • 2.Qxb4#
      • 1...Qc4
        • 2.Qxc4#
      • 1...Qd4
        • 2.c4#
      • 1...Qe4
        • 2.c4#
      • 1...Qf4
        • 2.c4#
      • 1...b5
        • 2.c3#
      • 1...bxa5!
    • 1.Qxg4+?
      • 1...Kb5
        • 2.Qc4#
        • 2.e8Q#
        • 2.e8B#
      • 1...hxg4!
  • Keys
    • 1.c3!
      • 1...Kb5
        • 2.e8Q#
        • 2.e8B#
      • 1...Qxh4
        • 2.Sd4#
      • 1...bxa5
        • 2.Rxa5#
      • 1...Qb4
        • 2.Qxb4#
      • 1...Qd4
        • 2.Sxd4#
      • 1...Qc4
        • 2.Qxc4#
      • 1...Qe4
        • 2.Sd4#
      • 1...Qf4
        • 2.Sd4#
      • 1...b5
        • 2.Sa1#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • K(a);N_SPINQ(b),S_FLIGHT::P=Q
    • Q(b);OGATE::QAR1(G),XQ(b)
    • Q(b);OGATE,P_PINP(C)::QAR2(G),XQ(b)
    • P(d);OGATE,P_SPINP(d),XP(H)::R1(L),XP(d)
  • Tries
    • Try
      • S(E);
      • Vars
        • K(a);N_SPINQ(b),S_FLIGHT::P=Q
        • Q(b);N_GUARD,N_SPINQ(b),SBLOCK,XQ(G)::B(B)+P(C)
        • Q(b);OGATE::QAR1(G),XQ(b)
        • Q(b);OGATE,P_PINP(C)::QAR2(G),XQ(b)
        • Q(b);N_GUARD::B(B)+P(C)
        • Q(b);N_GUARD,P_PINP(D)::B(B)+P(C)
        • P(d);SBLOCK::B(B)+P(C)
      • Refutation
        • P(d);P_SPINP(d),XP(H)
    • Try
      • Q(G);CHECK,XQ(b)
      • Refutation
        • P(c);XQ(G)
  • Actual
    • P(C);
    • Vars
      • K(a);N_SPINQ(b),S_FLIGHT::P=Q
      • Q(b);N_GUARD,N_SPINQ(b),SBLOCK,XQ(G)::B(B)+S(E)
      • P(d);OGATE,P_SPINP(d),XP(H)::R1(L),XP(d)
      • Q(b);OGATE::QAR1(G),XQ(b)
      • Q(b);N_GUARD::B(B)+S(E),XQ(b)
      • Q(b);OGATE,P_PINP(C)::QAR2(G),XQ(b)
      • Q(b);N_GUARD::B(B)+S(E)
      • Q(b);N_GUARD,P_PINP(D)::B(B)+S(E)
      • P(d);SBLOCK::B(B)+S(E)
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