MESON Chess Problem Database

Problem Display
PID: 52583 (k7/8/K7/8/QR5R/2b5/8/4r2b w - - 0 1)

Sonnenfeld, Felix Alexander

O Globo, 1930

k7/8/K7/8/QR5R/2b5/8/4r2b

#2

4 + 4

5309 O Mosqueteiro do Rei 1997

SOLUTION

  • SOUND
  • Sets
    • 1...Rb1
      • 2.Qe8#
    • 1...Rc1
      • 2.Qe8#
    • 1...Rf1
      • 2.Qe8#
    • 1...Rg1
      • 2.Qe8#
    • 1...Re4
      • 2.Qc6#
    • 1...Re8
      • 2.Qxe8#
    • 1...Be4
      • 2.Qe8#
    • 1...Bc6
      • 2.Qxc6#
  • Tries
    • 1.Rh8+?
      • 1...Re8
        • 2.Rxe8#
        • 2.Qxe8#
      • 1...Bxh8!
  • Keys
    • 1.Rhe4!
      • threat
        • 2.Qc6#
        • 2.Qe8#
      • 1...Rxe4
        • 2.Qc6#
      • 1...Bxe4
        • 2.Qe8#
      • 1...Bxb4
        • 2.Qe8#
      • 1...Ra1
        • 2.Re8#
      • 1...Rd1
        • 2.Qc6#
      • 1...Be5
        • 2.Qc6#
      • 1...Bf6
        • 2.Qc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 6
  • Sets
    • R(a);N_GUARD::QAR(A)
    • R(a);S_CUTB(b)::QAB(A)
    • R(a);N_GUARD::QAR(A),XR(a)
    • B(b);S_CUTR(a)::QAR(A)
    • B(b);N_GUARD::QAB(A),XB(b)
  • Tries
    • Try
      • R(C);CHECK
      • Refutation
        • B(c);XR(C)
  • Actual
    • R(C);
    • Threat
      • DUALS(2)
    • Vars
      • R(a);XR(C)::QAB(A)
      • B(b);XR(C)::QAR(A)
      • B(c);XR(B)::QAR(A)
      • R(a);N_GUARD,P_PINQ(A)::R(C)
      • R(a);::QAB(A)
      • B(c);::QAB(A)
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