MESON Chess Problem Database

Problem Display
PID: 245137 (8/7K/8/4n1pk/7p/7Q/5R2/8 w - - 0 1)

Larsen, Lars Aksglade (= Aksglade, Lars)

Smena (Moscow), 1996

8/7K/8/4n1pk/7p/7Q/5R2/8

#2

3 + 4

15148 Sadier Collection 2021
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...g4
      • 2.Rf5#
  • Tries
    • 1.Rg2?
      • 1...Sd3
        • 2.Qg4#
      • 1...Sf3
        • 2.Qg4#
      • 1...Sc4
        • 2.Qg4#
      • 1...Sg4
        • 2.Qxg4#
      • 1...Sc6
        • 2.Qg4#
      • 1...Sg6
        • 2.Qg4#
      • 1...Sd7
        • 2.Qg4#
      • 1...Sf7
        • 2.Qg4#
      • 1...g4!
    • 1.Rf5?
      • 1...Sd3
        • 2.Qf3#
      • 1...Sf3
        • 2.Qxf3#
      • 1...Sc4
        • 2.Qf3#
      • 1...Sc6
        • 2.Qf3#
      • 1...Sg6
        • 2.Qf3#
      • 1...Sd7
        • 2.Qf3#
      • 1...Sf7
        • 2.Qf3#
      • 1...Sg4!
    • 1.Qf3+?
      • 1...Sg4
        • 2.Qf7#
      • 1...g4
        • 2.Qf5#
      • 1...Sxf3!
  • Keys
    • 1.Rf4!
      • 1...gxf4
        • 2.Qf5#
      • 1...g4
        • 2.Rf5#
      • 1...Sd3
        • 2.Qg4#
      • 1...Sf3
        • 2.Qg4#
      • 1...Sc4
        • 2.Qg4#
      • 1...Sg4
        • 2.Qxg4#
      • 1...Sc6
        • 2.Qg4#
      • 1...Sg6
        • 2.Qg4#
      • 1...Sd7
        • 2.Qg4#
      • 1...Sf7
        • 2.Qg4#

Anticipated by 39400(1996)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 0
  • Sets
    • P(c);OGATEB::R(A)
  • Tries
    • Try
      • R(A);
      • Vars
        • S(b);N_GUARD::QAB1(B)
        • S(b);N_GUARD::QAB1(B),XS(b)
      • Refutation
        • P(c);
    • Try
      • R(A);
      • Vars
        • S(b);N_GUARD::QAB(B)
        • S(b);N_GUARD::QAB(B),XS(b)
      • Refutation
        • S(b);
    • Try
      • Q(B);CHECK,N_PINP(a)
      • Vars
        • S(b);N_GUARD,P_SPINS(b),SBLOCK::QAB(B)
        • P(c);OGATEB,P_SPINP(c)::QAR2(B)
      • Refutation
        • S(b);XQ(B)
  • Actual
    • R(A);
    • Vars
      • P(c);OGATEB,XR(A)::QAR2(B)
      • P(c);OGATEB::R(A)
      • S(b);N_GUARD::QAB1(B)
      • S(b);N_GUARD::QAB1(B),XS(b)
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