MESON Chess Problem Database

Problem Display
PID: 186965 (5b2/3Qp2K/3N4/3k4/p2PR3/r3pB2/p5p1/Bb1N4 w - - 0 1)

Evans, TC

The Observer, 1933

(First published on Sun Dec 10 1933)

5b2/3Qp2K/3N4/3k4/p2PR3/r3pB2/p5p1/Bb1N4

#2

8 + 9

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rc3
      • 2.Sxc3#
    • 1...Rd3
      • 2.Rxe3#
      • 2.Rf4#
      • 2.Rg4#
      • 2.Rh4#
      • 2.Re5#
      • 2.Re6#
      • 2.Rxe7#
    • 1...Bd3
      • 2.Sxe3#
    • 1...Bxe4+
      • 2.Bxe4#
    • 1...exd6
      • 2.Qb5#
  • Tries
    • 1.Kh8?
      • threat
        • 2.Re5#
      • 1...Bxe4
        • 2.Bxe4#
      • 1...exd6
        • 2.Qb5#
      • 1...Rc3
        • 2.Sxc3#
      • 1...e5
        • 2.Rxe5#
      • 1...Bg7+!
  • Keys
    • 1.Be2!
      • threat
        • 2.Bc4#
      • 1...Bxe4+
        • 2.Sf5#
      • 1...exd6
        • 2.Qb7#
      • 1...Rc3
        • 2.Sxc3#
      • 1...Rd3
        • 2.Re5#
      • 1...Bd3
        • 2.Sxe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • R(d);N_GUARD::S(B),XR(d)
    • B(a);S_CUTR(d)::S(B),XP(e)
    • B(a);CHECK,OGATE,P_SPINB(a),XR(E)::B(C),XB(a)
    • P(h);P_SPINP(h),SBLOCK,XS(F)::QAR2(G)
  • Tries
    • Try
      • K(H);N_SPINR(E),P-FLIGHT
      • Threat
        • B(C)+R(E),DCHECK
      • Vars
        • B(a);OGATE,P_SPINB(a),XR(E)::B(C),XB(a)
        • P(h);P_SPINP(h),SBLOCK,XS(F)::QAR2(G)
        • R(d);N_GUARD::S(B),XR(d)
        • P(h);::B(C)+R(E),DCHECK,XP(h)
      • Refutation
        • B(i);CHECK
  • Actual
    • B(C);
    • Threat
      • B(C)
    • Vars
      • B(a);CHECK,SBLOCK,XR(E)::QAR(G)+S(F)
      • P(h);P_SPINP(h),SBLOCK,XS(F)::QAB(G)
      • R(d);N_GUARD::S(B),XR(d)
      • R(d);N_PINR(E)::R1(E)
      • B(a);S_CUTR(d)::S(B),XP(e)
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