MESON Chess Problem Database

Problem Display
PID: 199574 (6Qb/K3pN1p/4NkP1/5np1/3R4/3PqR2/BB3n2/5r2 w - - 0 1)

Gevers, Raymond

The Observer, 1946

(First published on Sun Feb 17 1946)

6Qb/K3pN1p/4NkP1/5np1/3R4/3PqR2/BB3n2/5r2

#2

10 + 9

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd4+
      • 2.Bxd4#
    • 1...Qf4
      • 2.Rdxf4#
    • 1...Qxd3
      • 2.Rdxd3#
    • 1...Qxf3
      • 2.Rf4#
    • 1...Qe4
      • 2.Rxe4#
    • 1...Qxe6
      • 2.Rd6#
    • 1...Bg7
      • 2.Qxg7#
  • Tries
    • 1.Sxh8?
      • threat
        • 2.Qg7#
      • 1...Qxd4+
        • 2.Bxd4#
      • 1...Qxf3
        • 2.Rf4#
      • 1...Qxe6
        • 2.Rd6#
      • 1...Qf4
        • 2.Rdxf4#
      • 1...Ke5!
  • Keys
    • 1.Sh6!
      • threat
        • 2.Rxf5#
      • 1...Qxd4+
        • 2.Bxd4#
      • 1...Ke5
        • 2.Rxf5#
      • 1...Qxd3
        • 2.Rdxd3#
      • 1...Qxf3
        • 2.Rf4#
      • 1...Qxe6
        • 2.Rd6#
      • 1...Sxd3
        • 2.Sg4#
      • 1...hxg6
        • 2.Qxh8#
      • 1...Bg7
        • 2.Qxg7#
      • 1...Qf4
        • 2.Rdxf4#
      • 1...Qe4
        • 2.Rxe4#
      • 1...Qe5
        • 2.Qf7#
      • 1...Sd1
        • 2.Sg4#
      • 1...Sh1
        • 2.Sg4#
      • 1...Sh3
        • 2.Sg4#
      • 1...Se4
        • 2.Sg4#
      • 1...Sg4
        • 2.Sxg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 0
  • Sets
    • Q(c);CHECK,OGATE,P_SPINQ(c),XR(E)::B(B),XQ(c)
    • Q(c);N_PINR(E),N_SPINS(d)::B(B)+R(E),XQ(c)
    • Q(c);N_PINR(E),XP(C)::B(B)+R(E),XQ(c)
    • Q(c);N_PINR(E),N_SPINS(d),XR(D)::B(B)+R(E)
    • Q(c);N_PINR(E)::B(B)+R(E),XQ(c)
    • Q(c);N_PINR(E),XS(F)::B(B)+R(E)
    • B(i);N_GUARD::QAB1(J),XB(i)
  • Tries
    • Try
      • S(I);XB(i)
      • Threat
        • QAB1(J)
      • Vars
        • Q(c);CHECK,OGATE,P_SPINQ(c),XR(E)::B(B),XQ(c)
        • Q(c);N_PINR(E),N_SPINS(d),XR(D)::B(B)+R(E)
        • Q(c);N_PINR(E),XS(F)::B(B)+R(E)
        • Q(c);N_PINR(E),N_SPINS(d)::B(B)+R(E),XQ(c)
      • Refutation
        • K(f);N_SPINS(d),S_FLIGHT
  • Actual
    • S(I);
    • Threat
      • R1(D),XS(d)
    • Vars
      • Q(c);CHECK,OGATE,P_SPINQ(c),XR(E)::B(B),XQ(c)
      • K(f);N_SPINS(d),S_FLIGHT::R1(D),XS(d)
      • Q(c);N_PINR(E),XP(C)::B(B)+R(E),XQ(c)
      • Q(c);N_PINR(E),N_SPINS(d),XR(D)::B(B)+R(E)
      • Q(c);N_PINR(E),XS(F)::B(B)+R(E)
      • S(b);N_GUARD,XP(C)::S(I)
      • P(h);SBLOCK,XP(G)::QAB(J),XB(i)
      • B(i);N_GUARD::QAB1(J),XB(i)
      • Q(c);N_PINR(E),N_SPINS(d)::B(B)+R(E),XQ(c)
      • Q(c);N_PINR(E)::B(B)+R(E),XQ(c)
      • Q(c);N_PINR(E),SBLOCK::QAR1(J)
      • S(b);N_GUARD::S(I)
      • S(b);N_GUARD::S(I),XS(b)
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