MESON Chess Problem Database

Problem Display
PID: 190015 (8/3p4/3RNP1N/3Pk3/1Q6/8/4n3/K7 w - - 0 1)

Westberg, CE

Tidskrift for Schack, 1913

8/3p4/3RNP1N/3Pk3/1Q6/8/4n3/K7

#2

7 + 3

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Sc1
      • 2.Qf4#
    • 1...Sg1
      • 2.Qf4#
    • 1...Sc3
      • 2.Qf4#
    • 1...Sg3
      • 2.Qf4#
    • 1...Sf4
      • 2.Qxf4#
  • Tries
    • 1.Sg5?
      • threat
        • 2.Sf3#
        • 2.Sgf7#
      • 1...Sg1
        • 2.Sgf7#
      • 1...Sd4!
    • 1.Sf8?
      • threat
        • 2.Sg6#
        • 2.Sxd7#
      • 1...Sf4
        • 2.Sxd7#
      • 1...Sd4!
    • 1.Rxd7?
      • 1...Sd4
        • 2.Qxd4#
      • 1...Sc1
        • 2.Qd4#
        • 2.Qf4#
      • 1...Sg1
        • 2.Qd4#
        • 2.Qf4#
      • 1...Sc3
        • 2.Qd4#
        • 2.Qf4#
      • 1...Sg3
        • 2.Qd4#
        • 2.Qf4#
      • 1...Sf4
        • 2.Qd4#
        • 2.Qxf4#
      • 1...Kxf6!
    • 1.Qd4+?
      • 1...Kxd6
        • 2.Sf5#
        • 2.Sf7#
      • 1...Sxd4!
  • Keys
    • 1.Qd2!
      • 1...Ke4
        • 2.Qxe2#
      • 1...Kxd6
        • 2.Sf7#
      • 1...Kxf6
        • 2.Qg5#
      • 1...dxe6
        • 2.Rxe6#
      • 1...Sc1
        • 2.Qf4#
      • 1...Sg1
        • 2.Qf4#
      • 1...Sc3
        • 2.Qf4#
      • 1...Sg3
        • 2.Qf4#
      • 1...Sd4
        • 2.Qf4#
      • 1...Sf4
        • 2.Qxf4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::QAB1(B)
    • S(a);N_GUARD::QAB1(B),XS(a)
  • Tries
    • Try
      • S(E);
      • Threat
        • DUALS(2)
      • Vars
        • S(a);::S(E)
      • Refutation
        • S(a);
    • Try
      • S(E);
      • Threat
        • DUALS(2)
      • Vars
        • S(a);::S(E),XP(c)
      • Refutation
        • S(a);
    • Try
      • R(D);XP(c)
      • Vars
        • S(a);N_GUARD::QAB1(B),XS(a)
      • Refutation
        • K(b);S_FLIGHT,XP(F)
    • Try
      • Q(B);CHECK
      • Refutation
        • S(a);XQ(B)
  • Actual
    • Q(B);
    • Vars
      • K(b);P-FLIGHT::QAR2(B),XS(a)
      • K(b);S_FLIGHT,XR(D)::S(G)
      • K(b);S_FLIGHT,XP(F)::QAB1(B)
      • P(c);OGATE,XS(E)::R1(D),XP(c)
      • S(a);N_GUARD::QAB1(B)
      • S(a);N_GUARD::QAB1(B),XS(a)
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