MESON Chess Problem Database

Problem Display
PID: 270434 (Q7/8/B1qRpK1B/r1p5/b2Nk3/5p1p/7r/8 w - - 0 1)

Eddy, Edwin John

The Observer, 1959

(First published on Sun Feb 15 1959)

Q7/8/B1qRpK1B/r1p5/b2Nk3/5p1p/7r/8

#2

6 + 9

17397 Ling Notebooks 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Bd1
      • 2.Qxc6#
    • 1...Bc2
      • 2.Qxc6#
  • Tries
    • 1.Sf5?
      • threat
        • 2.Sg3#
        • 2.Bd3#
      • 1...Rxa6
        • 2.Sg3#
      • 1...exf5
        • 2.Bd3#
      • 1...Qd5
        • 2.Rxe6#
      • 1...Rd2
        • 2.Sg3#
      • 1...Rg2
        • 2.Bd3#
      • 1...Rb5
        • 2.Sg3#
        • 2.Qxc6#
      • 1...Bc2
        • 2.Sg3#
        • 2.Qxc6#
      • 1...Bb5
        • 2.Sg3#
      • 1...c4
        • 2.Sg3#
        • 2.Rd4#
      • 1...f2!
  • Keys
    • 1.Sb3!
      • threat
        • 2.Bd3#
      • 1...Rxa6
        • 2.Sxc5#
      • 1...f2
        • 2.Sd2#
      • 1...Qd5
        • 2.Rxe6#
      • 1...Rd2
        • 2.Sxd2#
      • 1...Rb5
        • 2.Qxc6#
      • 1...Bb5
        • 2.Sxc5#
      • 1...c4
        • 2.Rd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 2
  • Sets
    • B(d);N_GUARD::QAB(F),XQ(h)
  • Tries
    • Try
      • S(A);
      • Threat
        • DUALS(2)
      • Vars
        • R(f);XB(B)::S(A)
        • P(i);P_PINR(C),XS(A)::B(B)
        • Q(h);::R(C),XP(i)
        • R(a);::S(A)
        • R(a);::B(B)
        • B(d);::S(A)
      • Refutation
        • P(b);
  • Actual
    • S(A);
    • Threat
      • B(B)
    • Vars
      • R(f);N_GUARD,XB(B)::S(A),XP(g)
      • P(b);S_CUTR(a)::S(A)
      • Q(h);::R(C),XP(i)
      • R(a);N_GUARD::S(A),XR(a)
      • R(f);S_CUTB(d)::QAB(F),XQ(h)
      • B(d);S_CUTR(f)::S(A),XP(g)
      • P(g);N_GUARD::R1(C)
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