MESON Chess Problem Database

Problem Display
PID: 198764 (1nn2q2/1K1P1p1b/3k3N/b1N2R2/4RP2/8/8/8 w - - 0 1)

Pirnie, Duncan

2nd Prize, Surrey Weekly Press, 1921

1nn2q2/1K1P1p1b/3k3N/b1N2R2/4RP2/8/8/8

#2

7 + 7

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qxh6
      • 2.dxc8S#
    • 1...Qe7
      • 2.Rd4#
    • 1...Qg7
      • 2.dxc8S#
    • 1...Qd8
      • 2.Sxf7#
    • 1...Qe8
      • 2.dxe8S#
    • 1...Qh8
      • 2.Sxf7#
    • 1...Bd8
      • 2.dxc8S#
    • 1...f6
      • 2.Re6#
  • Tries
    • 1.d8Q+?
      • 1...Qxd8
        • 2.Sxf7#
      • 1...Sd7
        • 2.Rd4#
        • 2.Qxd7#
      • 1...Bxd8!
    • 1.d8R+?
      • 1...Qxd8
        • 2.Sxf7#
      • 1...Sd7
        • 2.Rxd7#
      • 1...Bxd8!
  • Keys
    • 1.Ree5!
      • threat
        • 2.Rf6#
      • 1...Qxh6
        • 2.dxc8S#
      • 1...Bxf5
        • 2.Sxf5#
      • 1...Sxd7
        • 2.Se4#
      • 1...Qe7
        • 2.Rd5#
      • 1...Qg7
        • 2.dxc8S#
      • 1...Qd8
        • 2.Sxf7#
      • 1...Qe8
        • 2.dxe8S#
      • 1...Qh8
        • 2.Sxf7#
      • 1...Bd8
        • 2.dxc8S#
      • 1...f6
        • 2.Re6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(g);N_GUARD,XS(E)::PXS(f)=S
    • Q(g);P_PINP(G),SBLOCK::R(A)
    • Q(g);N_GUARD::PXS(f)=S
    • Q(g);N_GUARD::S(E),XP(c)
    • Q(g);OGATE::PXQ(g)=S
    • B(a);S_CUTQ(g)::PXS(f)=S
    • P(c);N_GUARD::R1(A)
  • Tries
    • Try
      • P(G);CHECK
      • Vars
        • Q(g);XQ(G)::S(E),XP(c)
      • Refutation
        • B(a);XQ(G)
    • Try
      • P(G);CHECK
      • Vars
        • Q(g);XR(G)::S(E),XP(c)
        • S(e);N_GUARD,P_SPINS(e)::R1(G),XS(e)
      • Refutation
        • B(a);XR(G)
  • Actual
    • R(A);
    • Threat
      • R(D)
    • Vars
      • Q(g);N_GUARD,XS(E)::PXS(f)=S
      • B(d);XR(D)::S(E),XB(d)
      • S(e);SBLOCK,XP(G)::S(C)
      • Q(g);P_PINP(G),SBLOCK::R1(A)
      • Q(g);N_GUARD::PXS(f)=S
      • Q(g);N_GUARD::S(E),XP(c)
      • Q(g);OGATE::PXQ(g)=S
      • B(a);S_CUTQ(g)::PXS(f)=S
      • P(c);N_GUARD::R1(A)
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