MESON Chess Problem Database

Problem Display
PID: 112775 (4RK1b/5N2/3pNp2/3r1k1P/6n1/1RnP2B1/4P3/8 w - - 0 1)

McGregor, John NO

Toronto Globe, 1881

4RK1b/5N2/3pNp2/3r1k1P/6n1/1RnP2B1/4P3/8

#2

9 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rd4
      • 2.Sxd4#
    • 1...Ra5
      • 2.Sd4#
      • 2.Sxd6#
    • 1...Rb5
      • 2.Sd4#
      • 2.Sxd6#
    • 1...Rc5
      • 2.Sd4#
      • 2.Sxd6#
    • 1...Re5
      • 2.Sd4#
      • 2.Sxd6#
    • 1...Bg7+
      • 2.Sxg7#
    • 1...Sb1
      • 2.e4#
    • 1...Sd1
      • 2.e4#
    • 1...Sa2
      • 2.e4#
    • 1...Sa4
      • 2.e4#
    • 1...Sb5
      • 2.e4#
    • 1...Sf2
      • 2.Sh6#
    • 1...Sh2
      • 2.Sh6#
    • 1...Se3
      • 2.Sh6#
    • 1...Se5
      • 2.Sh6#
    • 1...Sh6
      • 2.Sxh6#
  • Tries
    • 1.Rxc3?
      • threat
        • 2.e4#
      • 1...Bg7+
        • 2.Sxg7#
      • 1...Sf2
        • 2.Sh6#
      • 1...Sh2
        • 2.Sh6#
      • 1...Se3
        • 2.Sh6#
      • 1...Se5
        • 2.Sh6#
      • 1...Sh6
        • 2.Sxh6#
      • 1...Rd4
        • 2.Sxd4#
      • 1...Re5
        • 2.Sd4#
        • 2.Sxd6#
      • 1...Rxd3!
    • 1.Rb4?
      • threat
        • 2.Rf4#
      • 1...Bg7+
        • 2.Sxg7#
      • 1...Rd4
        • 2.Sxd4#
      • 1...Se4
        • 2.dxe4#
      • 1...Sxe2!
  • Keys
    • 1.Rb5!
      • threat
        • 2.Sd4#
        • 2.Sxd6#
      • 1...Bg7+
        • 2.Sxg7#
      • 1...Sxe2
        • 2.Sxd6#
      • 1...Sxb5
        • 2.e4#
      • 1...Sf2
        • 2.Sh6#
      • 1...Sh2
        • 2.Sh6#
      • 1...Se3
        • 2.Sh6#
      • 1...Se5
        • 2.Sh6#
      • 1...Sh6
        • 2.Sxh6#
      • 1...Se4
        • 2.Sd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • R(c);N_GUARD::S(F),XR(c)
    • B(g);CHECK,N_GUARD::S(F),XB(g)
    • S(a);N_GUARD::P(A)
    • S(b);N_GUARD::S(G)
    • S(b);N_GUARD::S(G),XS(b)
  • Tries
    • Try
      • R(B);XS(a)
      • Threat
        • P(A)
      • Vars
        • B(g);CHECK,N_GUARD::S(F),XB(g)
        • S(b);N_GUARD::S(G)
        • S(b);N_GUARD::S(G),XS(b)
        • R(c);N_GUARD::S(F),XR(c)
      • Refutation
        • R(c);XP(C)
    • Try
      • R(B);
      • Threat
        • R1(B)
      • Vars
        • B(g);CHECK,N_GUARD::S(F),XB(g)
        • R(c);N_GUARD::S(F),XR(c)
        • S(a);OGATE::P(C),XS(a)
      • Refutation
        • S(a);XP(A)
  • Actual
    • R(B);P_PINR(c)
    • Threat
      • DUALS(2)
    • Vars
      • B(g);CHECK,N_GUARD::S(F),XB(g)
      • S(a);XP(A)::S(G),XP(e)
      • S(a);N_GUARD,N_SPINR(c),XR(B)::P(A)
      • S(b);N_GUARD::S(G)
      • S(b);N_GUARD,N_SPINR(c)::S(G)
      • S(b);N_GUARD::S(G),XS(b)
      • S(a);::S(F)
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