MESON Chess Problem Database

Problem Display
PID: 21931 (5Q1B/2K2P2/1pp4r/3k3r/N1p1n2R/3n2pB/N3P3/3Rq1b1 w - - 0 1)

Bukofzer, Maxwell

1st Prize, Good Companions, 1922

5Q1B/2K2P2/1pp4r/3k3r/N1p1n2R/3n2pB/N3P3/3Rq1b1

#2

10 + 11

3174 The Two-move Chess Problem Tradition and Development 1966

SOLUTION

  • SOUND
  • Sets
    • 1...Qf2
      • 2.Sb4#
    • 1...Qb4
      • 2.Sxb4#
    • 1...Qf1
      • 2.Sb4#
    • 1...Qxe2
      • 2.Sb4#
    • 1...Bh2
      • 2.Sxb6#
    • 1...Sd2
      • 2.S2c3#
      • 2.S4c3#
    • 1...Sf2
      • 2.Sxb6#
      • 2.Rd4#
    • 1...Sc3
      • 2.Sb4#
    • 1...Sc5
      • 2.Sxb6#
    • 1...Sf6
      • 2.Qd6#
  • Tries
    • 1.S4c3+?
      • 1...Sxc3
        • 2.Sb4#
      • 1...Qxc3!
    • 1.Rxd3+?
      • 1...Bd4
        • 2.Sxb6#
        • 2.Rxd4#
      • 1...cxd3!
    • 1.Qc5+?
      • 1...Sxc5
        • 2.Sxb6#
      • 1...bxc5
        • 2.Sb6#
      • 1...Bxc5!
    • 1.Qe7?
      • threat
        • 2.Qxe4#
      • 1...Qxe2
        • 2.Sb4#
      • 1...Rxh4
        • 2.Qe5#
      • 1...Re5
        • 2.Qxe5#
      • 1...Re6
        • 2.Bxe6#
        • 2.Qxe6#
      • 1...Sd2
        • 2.S2c3#
        • 2.S4c3#
      • 1...Sf2
        • 2.Sxb6#
        • 2.Rd4#
      • 1...Sc3
        • 2.Sb4#
      • 1...Sc5
        • 2.Sxb6#
      • 1...Sg5
        • 2.Qe5#
      • 1...Sf6
        • 2.Qd6#
        • 2.Qe6#
      • 1...Sd6!
  • Keys
    • 1.Qe8!
      • threat
        • 2.Qxe4#
      • 1...Qxe2
        • 2.Sb4#
      • 1...Rxh4
        • 2.Qe5#
      • 1...Re5
        • 2.Qxe5#
      • 1...Sd6
        • 2.Qxc6#
      • 1...Re6
        • 2.Bxe6#
        • 2.Qxe6#
      • 1...Sd2
        • 2.S2c3#
      • 1...Sf2
        • 2.Rd4#
      • 1...Sc3
        • 2.Sb4#
      • 1...Sc5
        • 2.Sxb6#
      • 1...Sg5
        • 2.Qe5#
      • 1...Sf6
        • 2.Qe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 4
  • Sets
    • Q(a);N_GUARD::S(B)
    • Q(a);N_GUARD::S(B),XQ(a)
    • Q(a);N_GUARD,XP(C)::S(B)
    • B(b);N_GUARD::S(E),XP(i)
    • S(f);S_CUTQ(a)::S(B)
    • S(f);S_CUTB(b)::S(E),XP(i)
    • S(f);N_GUARD,S_CUTR(k)::QAR1(I)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • S(f);XS(E)::S(B)
      • Refutation
        • Q(a);XS(E)
    • Try
      • R(A);CHECK,XS(c)
      • Refutation
        • P(e);XR(A)
    • Try
      • Q(I);CHECK
      • Vars
        • S(f);SBLOCK,XQ(I)::S(E),XP(i)
        • P(i);SBLOCK,XQ(I)::S(E)
      • Refutation
        • B(b);XQ(I)
    • Try
      • Q(I);
      • Threat
        • QAB1(I),XS(f)
      • Vars
        • Q(a);N_GUARD,XP(C)::S(B)
        • R(h);N_GUARD,XR(F)::QAR1(I)
        • R(h);N_GUARD::QAR1(I),XR(h)
        • S(f);S_CUTQ(a)::S(B)
        • S(f);S_CUTB(b)::S(E),XP(i)
        • S(f);S_CUTR(h)::QAR1(I)
      • Refutation
        • S(f);
  • Actual
    • Q(I);
    • Threat
      • QAB1(I),XS(f)
    • Vars
      • Q(a);N_GUARD,XP(C)::S(B)
      • R(h);N_GUARD,XR(F)::QAR1(I)
      • R(h);N_GUARD::QAR1(I),XR(h)
      • S(f);S_CUTR(k)::QAB1(I),XP(j)
      • S(f);N_GUARD,N_SPINS(c),S_CUTQ(a)::S(B)
      • S(f);OGATE::R1(F)
      • S(f);S_CUTQ(a)::S(B)
      • S(f);SBLOCK,S_CUTB(b)::S(E),XP(i)
      • S(f);S_CUTR(h)::QAR1(I)
      • S(f);S_CUTR(k)::QAB1(I)
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