MESON Chess Problem Database

Problem Display
PID: 188307 (8/4p3/4Q3/p2Nbp2/1p1pkp2/4qN1R/1K6/4R3 w - - 0 1)

Dobbs, Gilbert S

The Observer, 1937

(First published on Sun Jan 10 1937)

8/4p3/4Q3/p2Nbp2/1p1pkp2/4qN1R/1K6/4R3

#2

6 + 9

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe1
      • 2.Sg5#
    • 1...Qe2+
      • 2.Sd2#
    • 1...d3+
      • 2.Qxe5#
  • Tries
    • 1.Sxb4?
      • threat
        • 2.Sd2#
        • 2.Sg5#
        • 2.Qd5#
        • 2.Qxe5#
        • 2.Qc6#
      • 1...Qe2+
        • 2.Sd2#
        • 2.Rxe2#
      • 1...d3+
        • 2.Qxe5#
      • 1...Qxe1
        • 2.Sg5#
        • 2.Qxe5#
      • 1...axb4!
    • 1.Sf6+?
      • 1...Kd3
        • 2.Qb3#
        • 2.Qa6#
      • 1...exf6!
    • 1.Sxe7?
      • threat
        • 2.Qxf5#
      • 1...Qe2+
        • 2.Sd2#
      • 1...d3+
        • 2.Qxe5#
      • 1...Qxe1
        • 2.Sg5#
      • 1...Kd3!
  • Keys
    • 1.Qc6!
      • threat
        • 2.Sxb4#
      • 1...Qe2+
        • 2.Sd2#
      • 1...d3+
        • 2.Sc3#
      • 1...Kd3
        • 2.Qc2#
      • 1...Qxe1
        • 2.Sg5#
      • 1...b3
        • 2.Sb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(a);N_SPINQ(a),XR(A)::S(C)
    • Q(a);CHECK::S(C)
    • P(c);CHECK,SBLOCK::QAR1(F),XB(g)
  • Tries
    • Try
      • S(E);XP(b)
      • Threat
        • DUALS(5)
      • Vars
        • P(c);CHECK::QAR1(F),XB(g)
      • Refutation
        • P(f);XS(E)
    • Try
      • S(E);CHECK
      • Refutation
        • P(i);XS(E)
    • Try
      • S(E);XP(i)
      • Threat
        • QAB1(F),XP(h)
      • Vars
        • Q(a);CHECK::S(C)
        • P(c);CHECK,SBLOCK::QAR1(F),XB(g)
        • Q(a);N_SPINQ(a),XR(A)::S(C)
      • Refutation
        • K(d);N_SPINB(g),N_SPINQ(a),S_FLIGHT
  • Actual
    • Q(F);N_PINB(g)
    • Threat
      • QAB(F)+S(E),XP(b)
    • Vars
      • Q(a);CHECK::S(C)
      • P(c);CHECK,SBLOCK::QAB(F)+S(E),DCHECK
      • K(d);N_SPINQ(a),S_FLIGHT::QAB1(F)
      • Q(a);N_SPINQ(a),XR(A)::S(C)
      • P(b);::QAB(F)+S(E)
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