MESON Chess Problem Database

Problem Display
PID: 165048 (2r2b2/R2p2p1/N1k1p1R1/P3P3/1p1P4/8/1N2B2K/6Q1 w - - 0 1)

Howard, Kenneth Samuel

The Observer, 1927

(First published on Sun Apr 10 1927)

2r2b2/R2p2p1/N1k1p1R1/P3P3/1p1P4/8/1N2B2K/6Q1

#2

10 + 7

15239 Valois Notebooks 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Kd5
      • 2.Bf3#
    • 1...Bd6
      • 2.Qh1#
      • 2.Qg2#
    • 1...d6
      • 2.Sxb4#
  • Tries
    • 1.Sc7?
      • threat
        • 2.Bb5#
        • 2.d5#
      • 1...d5
        • 2.Bb5#
      • 1...d6
        • 2.Bb5#
      • 1...Rb8
        • 2.d5#
      • 1...Bd6
        • 2.Bf3#
        • 2.Bb5#
        • 2.Qh1#
        • 2.Qg2#
      • 1...Rxc7!
    • 1.Sb8+?
      • 1...Kd5
        • 2.Bf3#
      • 1...Rxb8!
    • 1.Bc4?
      • threat
        • 2.d5#
      • 1...Bd6
        • 2.Qh1#
        • 2.Qg2#
      • 1...d6
        • 2.Sxb4#
      • 1...d5!
    • 1.Rxe6+?
      • 1...Bd6
        • 2.Sxb4#
        • 2.Rxd6#
        • 2.Qh1#
        • 2.Qg2#
      • 1...dxe6
        • 2.Qh1#
        • 2.Qg2#
      • 1...d6
        • 2.Sxb4#
        • 2.Qh1#
        • 2.Qg2#
      • 1...Kd5!
    • 1.Rc7+?
      • 1...Kd5
        • 2.Bf3#
      • 1...Rxc7!
    • 1.Qc1+?
      • 1...Bc5
        • 2.Sxb4#
        • 2.Qxc5#
      • 1...Kd5!
  • Keys
    • 1.Qd1!
      • threat
        • 2.d5#
      • 1...Kd5
        • 2.Bf3#
      • 1...Bd6
        • 2.Qh1#
      • 1...d5
        • 2.Qa4#
      • 1...d6
        • 2.Sxb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(b);N_SPINP(c),S_FLIGHT::B(C)
    • P(d);N_SPINP(c),S_CUTB(g)::S(H),XP(a)
  • Tries
    • Try
      • S(H);
      • Threat
        • DUALS(2)
      • Vars
        • P(d);::B(C)
        • P(d);N_SPINP(c)::B(C)
        • R(f);::P(E)
      • Refutation
        • R(f);XS(H)
    • Try
      • S(H);CHECK
      • Vars
        • K(b);N_SPINP(c),S_FLIGHT::B(C)
      • Refutation
        • R(f);XS(H)
    • Try
      • B(C);
      • Threat
        • P(E)
      • Vars
        • P(d);N_SPINP(c),S_CUTB(g)::S(H),XP(a)
      • Refutation
        • P(d);
    • Try
      • R(I);CHECK,XP(c)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • R(J);CHECK
      • Vars
        • K(b);N_SPINP(c),S_FLIGHT::B(C)
      • Refutation
        • R(f);XR(J)
    • Try
      • Q(A);CHECK
      • Refutation
        • K(b);N_SPINP(c),S_FLIGHT
  • Actual
    • Q(A);
    • Threat
      • P(E)
    • Vars
      • K(b);N_SPINP(c),S_FLIGHT::B(C)
      • B(g);N_SPINP(c),P_PINP(G),S_CUTP(d)::QAB(A)
      • P(d);SBLOCK::QAB(A)
      • P(d);N_SPINP(c),S_CUTB(g)::S(H),XP(a)
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