MESON Chess Problem Database

Problem Display
PID: 178502 (K3Qn2/n1pp2p1/5p2/5kbP/3PN3/6P1/7N/1B5q w - - 0 1)

Messenger, A

3rd Prize, London Transport Ty. (Busmen's Chess Review), 1963

K3Qn2/n1pp2p1/5p2/5kbP/3PN3/6P1/7N/1B5q

#2

8 + 9

1111 Busmen's Chess Review 1964

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe4+
      • 2.Bxe4#
      • 2.Qxe4#
    • 1...Qc1
      • 2.Sd6#
    • 1...Qd1
      • 2.Sd6#
    • 1...Qe1
      • 2.Sd6#
    • 1...Qf1
      • 2.Sd6#
    • 1...Qg1
      • 2.Sd6#
    • 1...Qxh2
      • 2.Sf2#
    • 1...Bf4
      • 2.g4#
    • 1...Sc6
      • 2.Sd6#
    • 1...Se6
      • 2.Qg6#
    • 1...Sg6
      • 2.Qxd7#
    • 1...Sh7
      • 2.Qxd7#
    • 1...c6
      • 2.Sd6#
    • 1...d5
      • 2.Sd6#
  • Tries
    • 1.Qxd7+?
      • 1...Se6
        • 2.Qd5#
      • 1...Sxd7!
  • Keys
    • 1.Qf7!
      • threat
        • 2.Qd5#
      • 1...Qxh2
        • 2.Sf2#
      • 1...Bf4
        • 2.g4#
      • 1...Sc6
        • 2.Sd6#
      • 1...Se6
        • 2.Qg6#
      • 1...Sg6
        • 2.Qxd7#
      • 1...c6
        • 2.Sd6#
      • 1...d5
        • 2.Sd6#
        • 2.Qxd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 7
  • Sets
    • Q(a);N_PINS(E)::B(A)+S(E),DCHECK
    • Q(a);N_PINS(E),XS(B)::B(A)+S(E)
    • B(c);SBLOCK::P(C)
    • S(e);N_PINS(E)::B(A)+S(E),DCHECK
    • S(i);N_GUARD,SBLOCK::QAB1(H)
    • S(i);N_GUARD::QAB(H),XP(g)
    • P(f);N_PINS(E)::B(A)+S(E),DCHECK
    • P(g);N_PINS(E)::B(A)+S(E),DCHECK
  • Tries
    • Try
      • Q(H);CHECK,XP(g)
      • Vars
        • S(i);P_SPINS(i)::QAR2(H)
      • Refutation
        • S(i);XQ(H)
  • Actual
    • Q(H);P_PINP(d)
    • Threat
      • QAR2(H)
    • Vars
      • Q(a);N_PINS(E),XS(B)::B(A)+S(E)
      • B(c);SBLOCK::P(C)
      • S(e);N_PINS(E)::B(A)+S(E),DCHECK
      • S(i);N_GUARD,SBLOCK::QAB1(H)
      • S(i);N_GUARD::QAB(H),XP(g)
      • P(f);N_PINS(E)::B(A)+S(E),DCHECK
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