MESON Chess Problem Database

Problem Display
PID: 185867 (2B5/3r4/r3n2R/5k2/p4P1p/7p/5N1K/bbB1QN2 w - - 0 1)

Andrade, Barry Jack da Costa

The Observer, 1932

(First published on Sun Feb 21 1932)

2B5/3r4/r3n2R/5k2/p4P1p/7p/5N1K/bbB1QN2

#2

8 + 9

15239 Valois Notebooks 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Ra5
      • 2.Qxe6#
    • 1...Raa7
      • 2.Qxe6#
    • 1...Ra8
      • 2.Qxe6#
    • 1...Rd3
      • 2.Qe4#
    • 1...Rd4
      • 2.Qe5#
    • 1...Be5
      • 2.Qxe5#
    • 1...Ba2
      • 2.Qe4#
    • 1...Be4
      • 2.Qxe4#
    • 1...Sd4
      • 2.Qe5#
  • Keys
    • 1.Qb4!
      • threat
        • 2.Se3#
      • 1...Sxf4
        • 2.Qxf4#
      • 1...Rd3
        • 2.Qe4#
      • 1...Rd4
        • 2.Qf8#
      • 1...Bd4
        • 2.Qxb1#
      • 1...Be4
        • 2.Qxe4#
      • 1...Sd4
        • 2.Qc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • R(g);N_GUARD::QAB1(B),XS(h)
    • R(i);P_SPINS(h),S_CUTB(b)::QAB1(B)
    • R(i);P_SPINS(h),S_CUTB(a)::QAR1(B)
    • B(a);N_GUARD,P_PINP(F)::QAR1(B),XB(a)
    • B(b);N_GUARD::QAB1(B)
    • B(b);N_GUARD::QAB1(B),XB(b)
    • S(h);P_SPINR(i),S_CUTB(a)::QAR1(B)
  • Actual
    • Q(B);
    • Threat
      • S(C)
    • Vars
      • S(h);OGATE,P_SPINR(i),XP(F)::QAR1(B),XS(h)
      • R(i);P_SPINS(h),S_CUTB(b)::QAB1(B)
      • R(i);N_GUARD,P_SPINS(h),S_CUTB(a)::QAR(B)
      • B(a);S_CUTR(i)::QAB(B),XB(b)
      • B(b);N_GUARD::QAB1(B),XB(b)
      • S(h);N_GUARD,P_SPINR(i),S_CUTB(a)::QAR(B)
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