MESON Chess Problem Database

Problem Display
PID: 203193 (2B5/2N5/8/2p1PP2/R1qbk3/6Q1/2NnP3/7K w - - 0 1)

Woodward, LA

The Observer, 1951

(First published on Sun Aug 19 1951)

2B5/2N5/8/2p1PP2/R1qbk3/6Q1/2NnP3/7K

#2

9 + 5

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qa2
      • 2.Qe3#
    • 1...Qd3
      • 2.exd3#
    • 1...Qb5
      • 2.Qe3#
    • 1...Qd5
      • 2.Qe3#
    • 1...Qa6
      • 2.Qe3#
    • 1...Qf7
      • 2.Qe3#
    • 1...Qg8
      • 2.Qe3#
    • 1...Ba1
      • 2.Qe3#
    • 1...Bb2
      • 2.Qe3#
    • 1...Bc3
      • 2.Qe3#
    • 1...Be3
      • 2.Qxe3#
    • 1...Bxe5
      • 2.Qe3#
  • Keys
    • 1.Sd5!
      • threat
        • 2.Sf6#
      • 1...Kxd5
        • 2.Bb7#
      • 1...Qxd5
        • 2.Qe3#
      • 1...Bxe5
        • 2.Qd3#
      • 1...Qa6
        • 2.Sc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 9
  • Sets
    • Q(b);P_SPINB(c)::QAR1(D)
    • Q(b);OGATE,P_SPINB(c)::P(C),XQ(b)
    • B(c);N_GUARD,P_SPINQ(b)::QAR1(D)
    • B(c);N_GUARD,P_SPINQ(b)::QAR1(D),XB(c)
    • B(c);N_GUARD,P_SPINQ(b),SBLOCK,XP(F)::QAR1(D)
  • Actual
    • S(H);
    • Threat
      • S(H)
    • Vars
      • K(d);OGATEB,S_FLIGHT,XS(H)::B(I)
      • Q(b);P_SPINB(c),SBLOCK,XS(H)::QAR1(D)
      • B(c);P_SPINQ(b),SBLOCK,XP(F)::QAB1(D)
      • Q(b);N_GUARD,P_SPINB(c)::S(H)
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