MESON Chess Problem Database

Problem Display
PID: 249401 (7B/8/1pp5/2pn4/4Pk2/QpN3R1/3P3K/8 w - - 0 1)

Groeneveld, Cornelis

Uralski Problemist, 2000

7B/8/1pp5/2pn4/4Pk2/QpN3R1/3P3K/8

#2

7 + 6

5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Se3
      • 2.dxe3#
    • 1...c4
      • 2.Qd6#
  • Tries
    • 1.Qxc5?
      • threat
        • 2.Qf2#
        • 2.Qd6#
      • 1...Sxc3
        • 2.Qe3#
        • 2.Qe5#
        • 2.Qf5#
      • 1...Se3
        • 2.Be5#
        • 2.Qxe3#
        • 2.Qd6#
        • 2.Qe5#
        • 2.Qg5#
        • 2.dxe3#
      • 1...Sf6
        • 2.Qd6#
        • 2.Qf5#
        • 2.Qg5#
      • 1...bxc5!
    • 1.d3?
      • threat
        • 2.Se2#
      • 1...Sxc3
        • 2.Qc1#
      • 1...Sf6!
    • 1.d4?
      • threat
        • 2.Be5#
      • 1...cxd4
        • 2.Qd6#
      • 1...Sf6
        • 2.Qc1#
      • 1...Sxc3!
  • Keys
    • 1.Qc1!
      • threat
        • 2.Qf1#
      • 1...Sxc3
        • 2.d3#
      • 1...Sf6
        • 2.d4#
      • 1...Se3
        • 2.dxe3#

Anticipated by 52399(1972), 243155(1972)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • S(d);OGATE::P(A),XS(d)
    • P(c);OGATE::QAB(C)
  • Tries
    • Try
      • Q(C);XP(c)
      • Threat
        • DUALS(2)
      • Refutation
        • P(e);XQ(C)
    • Try
      • P(A);
      • Threat
        • S(D)
      • Vars
        • S(d);N_GUARD,XS(D)::QAB(C)
      • Refutation
        • S(d);
    • Try
      • P(A);
      • Threat
        • B(G)
      • Vars
        • P(c);OGATE,XP(A)::QAB(C)
        • S(d);N_GUARD::QAB(C)
      • Refutation
        • S(d);XS(D)
  • Actual
    • Q(C);
    • Threat
      • QAR(C)
    • Vars
      • S(d);N_GUARD,XS(D)::QAB(C)+P(A)
      • S(d);N_GUARD::QAB(C)+P(A)
      • S(d);OGATE::P(A),XS(d)
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