MESON Chess Problem Database

Problem Display
PID: 40373 (B4N1B/5PK1/4N1pr/4kp2/1Qp1P3/1npr1nP1/3bR3/1q6 w - - 0 1)

Butcher, FG

The Observer, 1960

(First published on Sun Apr 3 1960)

B4N1B/5PK1/4N1pr/4kp2/1Qp1P3/1npr1nP1/3bR3/1q6

#2

10 + 11

17397 Ling Notebooks 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Re3
      • 2.Kxh6#
      • 2.Qb8#
    • 1...Rh7+
      • 2.Kxh7#
    • 1...Be1
      • 2.Kxh6#
    • 1...Bf4
      • 2.gxf4#
    • 1...Sbd4
      • 2.Qc5#
    • 1...Sfd4
      • 2.Qb8#
    • 1...Sg5
      • 2.Kxh6#
    • 1...f4
      • 2.Kxh6#
    • 1...g5
      • 2.Kxh6#
  • Tries
    • 1.Sxg6+?
      • 1...Kxe6
        • 2.Qe7#
        • 2.f8S#
      • 1...Rxg6+!
    • 1.Sd7+?
      • 1...Kxe6
        • 2.f8S#
      • 1...Rxd7!
    • 1.Qc5+?
      • 1...Rd5
        • 2.Qxd5#
      • 1...Sxc5!
  • Keys
    • 1.Sd4!
      • threat
        • 2.Sc6#
      • 1...Rh7+
        • 2.Kxh7#
      • 1...Kxd4
        • 2.Qd6#
      • 1...Rxd4
        • 2.Qe7#
      • 1...Sbxd4
        • 2.Qc5#
      • 1...Sfxd4
        • 2.Qb8#
      • 1...fxe4
        • 2.Rxe4#
      • 1...Sc5
        • 2.Qxc5#
      • 1...Re3
        • 2.Kxh6#
      • 1...Be3
        • 2.Sxf3#
      • 1...Sa5
        • 2.Qc5#
      • 1...g5
        • 2.Kxh6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 4
  • Sets
    • R(k);CHECK::B(J)+K(G),XR(k)
    • B(b);::B(J)+K(G),XR(k)
    • B(b);OGATE::P(B),XB(b)
    • S(c);N_GUARD,S_CUTR(e)::QAR2(C)
    • S(f);S_CUTR(e)::QAB(C)
    • S(f);::B(J)+K(G),XR(k)
    • P(i);::B(J)+K(G),XR(k)
    • P(j);::B(J)+K(G),XR(k)
  • Tries
    • Try
      • S(I);CHECK,XP(j)
      • Refutation
        • R(k);CHECK,XS(I)
    • Try
      • S(I);CHECK
      • Vars
        • K(h);P-FLIGHT,XS(E)::P=S
      • Refutation
        • R(e);P_PINP(F),XS(I)
    • Try
      • Q(C);CHECK
      • Vars
        • R(e);N_GUARD,P_SPINR(e)::QAR1(C),XR(e)
      • Refutation
        • S(c);XQ(C)
  • Actual
    • S(E);
    • Threat
      • S(E)
    • Vars
      • R(k);CHECK::B(J)+K(G),XR(k)
      • K(h);P_SPINP(g),S_FLIGHT,XS(E)::QAR2(C)
      • R(e);SBLOCK,XS(E)::QAR2(C)
      • S(c);N_GUARD,XS(E)::QAR2(C)
      • S(f);SBLOCK,XS(E)::QAB(C)
      • P(i);OGATE,P_SPINP(i),XP(D)::R1(A),XP(i)
      • S(c);N_GUARD::QAR2(C),XS(c)
      • R(e);::B(J)+K(G),XR(k)
      • B(b);S_CUTR(e)::S(E),XS(f)
      • S(c);N_GUARD::QAR2(C)
      • P(j);::B(J)+K(G),XR(k)
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