MESON Chess Problem Database

Problem Display
PID: 40544 (N1nKB3/2Qpp3/Rb1qkN2/6P1/4P1p1/8/7B/5R2 w - - 0 1)

Willems, PJH

Recomm., BCF 028. Ty., 1938-1939

N1nKB3/2Qpp3/Rb1qkN2/6P1/4P1p1/8/7B/5R2

#2

10 + 7

5454 Near Snap 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc7+
      • 2.Sxc7#
    • 1...Qd5
      • 2.exd5#
    • 1...Bg1
      • 2.Qc4#
      • 2.Qxd7#
    • 1...Bf2
      • 2.Qc4#
      • 2.Qxd7#
    • 1...Be3
      • 2.Qc4#
      • 2.Qxd7#
    • 1...Bd4
      • 2.Qc4#
      • 2.Qxd7#
    • 1...Bc5
      • 2.Qxd7#
    • 1...Ba7
      • 2.Qc4#
      • 2.Qxd7#
    • 1...Bxc7+
      • 2.Sxc7#
    • 1...exf6
      • 2.Rxf6#
  • Tries
    • 1.Sxg4?
      • threat
        • 2.Bf7#
      • 1...Qxc7+
        • 2.Sxc7#
      • 1...Bxc7+
        • 2.Sxc7#
      • 1...Bf2
        • 2.Qc4#
        • 2.Qxd7#
      • 1...Qf4!
    • 1.Sd5?
      • threat
        • 2.Bf7#
      • 1...Qxc7+
        • 2.Sdxc7#
        • 2.Saxc7#
      • 1...Bxc7+
        • 2.Sdxc7#
        • 2.Saxc7#
      • 1...Qf4
        • 2.Sxf4#
      • 1...Bf2
        • 2.Qxd7#
      • 1...g3!
    • 1.Sh5?
      • threat
        • 2.Sg7#
        • 2.Bf7#
      • 1...Qxc7+
        • 2.Sxc7#
      • 1...Bxc7+
        • 2.Sxc7#
      • 1...Qf4
        • 2.Sxf4#
        • 2.Sg7#
      • 1...Qe5
        • 2.Bxd7#
        • 2.Bf7#
      • 1...Qd4
        • 2.Sf4#
        • 2.Bf7#
      • 1...Bf2
        • 2.Sg7#
        • 2.Qc4#
        • 2.Qxd7#
      • 1...Bd4
        • 2.Bxd7#
        • 2.Bf7#
        • 2.Qc4#
        • 2.Qxd7#
      • 1...g3!
  • Keys
    • 1.Sxd7!
      • threat
        • 2.Bf7#
      • 1...Qxc7+
        • 2.Sxc7#
      • 1...Qxd7+
        • 2.Bxd7#
      • 1...Bxc7+
        • 2.Sxc7#
      • 1...Qf4
        • 2.Sc5#
      • 1...Bf2
        • 2.Qc4#

Anticipated by 6755(1933)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • Q(c);CHECK,P_SPINB(b),XQ(G)::S(H),XQ(c)
    • Q(c);OGATE,P_SPINB(b)::P(C),XQ(c)
    • B(b);N_PINQ(G),P_SPINQ(c)::QAB1(G),XP(e)
    • B(b);CHECK,P_SPINQ(c),XQ(G)::S(H),XB(b)
    • P(f);OGATE,XS(F)::R1(A),XP(f)
  • Tries
    • Try
      • S(F);XP(a)
      • Threat
        • B(J)
      • Vars
        • Q(c);CHECK,P_SPINB(b),XQ(G)::S(H),XQ(c)
        • B(b);CHECK,P_SPINQ(c),XQ(G)::S(H),XB(b)
      • Refutation
        • Q(c);P_SPINB(b)
    • Try
      • S(F);
      • Threat
        • B(J)
      • Vars
        • Q(c);N_GUARD,P_SPINB(b)::S(F),XQ(c)
        • B(b);N_PINQ(G),P_SPINQ(c)::QAB1(G),XP(e)
      • Refutation
        • P(a);
    • Try
      • S(F);
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);CHECK,P_SPINB(b),XQ(G)::S(H),XQ(c)
        • B(b);CHECK,P_SPINQ(c),XQ(G)::S(H),XB(b)
      • Refutation
        • P(a);
  • Actual
    • S(F);P_SPINS(F),XP(e)
    • Threat
      • B(J)
    • Vars
      • Q(c);CHECK,N_PINS(F),P_SPINB(b),XQ(G)::S(H),XQ(c)
      • Q(c);CHECK,OGATE,P_SPINB(b),XS(F)::B(J),XQ(c)
      • B(b);CHECK,P_SPINQ(c),XQ(G)::S(H),XB(b)
      • Q(c);N_PINS(F),P_SPINB(b)::S(F)
      • B(b);N_PINQ(G),P_SPINQ(c)::QAB(G)
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