MESON Chess Problem Database

Problem Display
PID: 52321 (3BB3/8/3kpN2/rn5R/r3Q2K/2pq2p1/1Nn3p1/3R1bb1 w - - 0 1)

Howard, Kenneth Samuel

Pittsburgh Post, 1925

3BB3/8/3kpN2/rn5R/r3Q2K/2pq2p1/1Nn3p1/3R1bb1

#2

8 + 12

5064 100 Years of the American Two-move Chess Problem 1962

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Sc4#
      • 2.Qc6#
      • 2.Qe5#
    • 1...Ra2
      • 2.Sc4#
      • 2.Qc6#
      • 2.Qe5#
    • 1...Ra3
      • 2.Sc4#
      • 2.Qc6#
      • 2.Qe5#
    • 1...Rc4
      • 2.Sxc4#
    • 1...Rxe4+
      • 2.Sxe4#
    • 1...Bd4
      • 2.Qc6#
    • 1...Sb4
      • 2.Sc4#
      • 2.Qe5#
    • 1...Scd4
      • 2.Qe5#
  • Tries
    • 1.Rxd3+?
      • 1...Rd4
        • 2.Sc4#
      • 1...Bd4
        • 2.Qc6#
        • 2.Qe5#
      • 1...Scd4
        • 2.Qc6#
        • 2.Qe5#
      • 1...Sbd4
        • 2.Qc6#
      • 1...Bxd3!
    • 1.Qb4+?
      • 1...Bc5
        • 2.Sc4#
        • 2.Se4#
      • 1...Sxb4
        • 2.Sc4#
        • 2.Se4#
      • 1...Rxb4+!
  • Keys
    • 1.Qc4!
      • threat
        • 2.Se4#
      • 1...Rxc4+
        • 2.Sxc4#
      • 1...Bd4
        • 2.Qc6#
      • 1...Scd4
        • 2.Qc5#
      • 1...Sbd4
        • 2.Qc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • R(h);N_GUARD::S(B),XR(h)
    • R(h);CHECK,XQ(C)::S(F),XR(h)
    • B(b);N_PINQ(C),N_SPINQ(f)::QAR1(C)
    • S(c);N_PINQ(C),N_SPINQ(f)::QAB1(C)
  • Tries
    • Try
      • R(A);CHECK,XQ(f)
      • Vars
        • R(h);P_SPINR(h)::S(B)
        • S(j);N_PINQ(C),P_SPINS(j)::QAR1(C)
      • Refutation
        • B(a);XR(A)
    • Try
      • Q(C);CHECK
      • Refutation
        • R(h);CHECK,XQ(C)
  • Actual
    • Q(C);
    • Threat
      • S(F)
    • Vars
      • R(h);CHECK,XQ(C)::S(B),XR(h)
      • B(b);N_PINQ(C),N_SPINQ(f)::QAR1(C)
      • S(c);N_PINQ(C),N_SPINQ(f)::QAB1(C)
      • S(j);N_PINQ(C),N_SPINQ(f)::QAB1(C)
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