MESON Chess Problem Database

Problem Display
PID: 116127 (4N1Q1/3r1q2/2BBNp1p/1RpK1k2/8/6R1/7n/8 w - - 0 1)

Godbout, Alain J

Apprenti Sorcier, 1997

4N1Q1/3r1q2/2BBNp1p/1RpK1k2/8/6R1/7n/8

#2

8 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe6+
      • 2.Qxe6#
    • 1...Qg6
      • 2.Qxg6#
    • 1...Qe7
      • 2.Qg6#
    • 1...Qf8
      • 2.Qg6#
    • 1...Rxd6+
      • 2.Sxd6#
    • 1...Sf1
      • 2.Rf3#
      • 2.Qg4#
    • 1...Sf3
      • 2.Rxf3#
      • 2.Qg4#
    • 1...Sg4
      • 2.Rf3#
      • 2.Qxg4#
  • Tries
    • 1.Qxf7?
      • threat
        • 2.S6g7#
        • 2.S8g7#
        • 2.Qh5#
        • 2.Qg6#
        • 2.Qxf6#
      • 1...Rxd6+
        • 2.Sxd6#
      • 1...Sf3
        • 2.S6g7#
        • 2.S8g7#
        • 2.Qg6#
        • 2.Qxf6#
      • 1...Sg4
        • 2.S8g7#
        • 2.Rf3#
        • 2.Qh5#
      • 1...h5
        • 2.S6g7#
        • 2.S8g7#
        • 2.Rg5#
        • 2.Qxh5#
        • 2.Qg6#
        • 2.Qxf6#
      • 1...Rxf7!
    • 1.Qh7+?
      • 1...Qg6
        • 2.Qxg6#
      • 1...Qxh7!
  • Keys
    • 1.Kxc5!
      • threat
        • 2.Sd4#
      • 1...Kxe6
        • 2.Sg7#
      • 1...Qxe6
        • 2.Qg6#
      • 1...Rxd6
        • 2.Kxd6#
      • 1...Sf3
        • 2.Qg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • Q(g);CHECK,OGATE,XS(F)::QAB1(H),XQ(g)
    • Q(g);N_GUARD,N_PINS(F)::QAB1(H),XQ(g)
    • Q(g);N_GUARD,N_PINS(F)::QAB1(H)
    • R(f);CHECK,XB(E)::S(G),XR(f)
  • Tries
    • Try
      • Q(H);N_SPINS(F),P_PINP(d),XQ(g)
      • Threat
        • DUALS(5)
      • Vars
        • R(f);CHECK,XB(E)::S(G),XR(f)
      • Refutation
        • R(f);N_PINB(E),N_SPINP(d),XQ(H)
    • Try
      • Q(H);CHECK
      • Vars
        • Q(g);N_GUARD,N_PINS(F),P_SPINQ(g)::QAB1(H),XQ(g)
      • Refutation
        • Q(g);N_PINS(F),XQ(H)
  • Actual
    • K(C);N_SPINB(E),N_SPINS(F),P-FLIGHT,XP(b)
    • Threat
      • S(F)
    • Vars
      • K(c);P_SPINQ(g),S_FLIGHT,XS(F)::S(G)
      • Q(g);N_GUARD,SBLOCK,XS(F)::QAB1(H)
      • R(f);XB(E)::R(B)+K(C),XR(f)
      • S(a);N_GUARD::QAB1(H)
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