MESON Chess Problem Database

Problem Display
PID: 185028 (2K5/8/2N5/p2Q4/k7/r1b5/2rp4/1b1B4 w - - 0 1)

Andrade, Barry Jack da Costa

The Observer, 1930

(First published on Sun Jan 5 1930)

2K5/8/2N5/p2Q4/k7/r1b5/2rp4/1b1B4

#2

4 + 7

5454 Near Snap 2018
15239 Valois Notebooks 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Ba1
      • 2.Qc4#
    • 1...Bb2
      • 2.Qc4#
    • 1...Bd4
      • 2.Qc4#
    • 1...Be5
      • 2.Qc4#
    • 1...Bf6
      • 2.Qc4#
    • 1...Bg7
      • 2.Qc4#
    • 1...Bh8
      • 2.Qc4#
  • Tries
    • 1.Bxc2+?
      • 1...Rb3
        • 2.Qxb3#
      • 1...Bxc2!
  • Keys
    • 1.Sd4!
      • threat
        • 2.Qb5#
      • 1...Ba1+
        • 2.Qc4#
      • 1...Bb2+
        • 2.Qc4#
      • 1...Bb4+
        • 2.Qc6#
      • 1...Bxd4+
        • 2.Qc4#
      • 1...Kb4
        • 2.Qb5#
      • 1...Ra1
        • 2.Qb3#
      • 1...Ra2
        • 2.Qb3#
      • 1...Rb3
        • 2.Qxb3#

Anticipated by 21482(1919)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 4
  • Sets
    • B(e);N_GUARD,P_PINS(C)::QAR2(B)
  • Tries
    • Try
      • B(A);CHECK,XR(b)
      • Vars
        • R(d);N_GUARD,P_SPINR(d)::QAB1(B),XR(d)
      • Refutation
        • B(a);XB(A)
  • Actual
    • S(C);
    • Threat
      • QAB1(B)
    • Vars
      • B(e);CHECK,N_GUARD::QAR2(B)
      • B(e);CHECK,SBLOCK::QAB(B)
      • B(e);CHECK,N_GUARD,XS(C)::QAR2(B)
      • K(f);N_SPINR(b),P-FLIGHT::QAR1(B)
      • R(d);N_GUARD::QAB1(B)
      • R(d);N_GUARD,N_SPINR(b)::QAB1(B),XR(d)
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