MESON Chess Problem Database

Problem Display
PID: 17815 (5nb1/4p3/Q3N1p1/2Ppk3/2p1P2R/2n1N1PB/7B/5R1K w - - 0 1)

Valve, Leo Erland

1st Prize, Arbejder-Skak, 1951

5nb1/4p3/Q3N1p1/2Ppk3/2p1P2R/2n1N1PB/7B/5R1K

#2

11 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Sxe4
      • 2.Sg4#
    • 1...dxe4
      • 2.g4#
    • 1...d4
      • 2.Sxc4#
    • 1...g5
      • 2.Rf5#
  • Tries
    • 1.Sd4?
      • threat
        • 2.Sf3#
        • 2.Sc6#
      • 1...dxe4
        • 2.Sc6#
      • 1...Be6
        • 2.Sc6#
      • 1...Se6
        • 2.Sc6#
      • 1...e6
        • 2.Sc6#
      • 1...Kxd4!
  • Keys
    • 1.Qxc4!
      • threat
        • 2.Qd4#
      • 1...Bxe6
        • 2.g4#
      • 1...Sxe6
        • 2.Sg4#
      • 1...dxc4
        • 2.Sxc4#
      • 1...Se2
        • 2.Qxd5#
      • 1...Sb5
        • 2.Qxd5#
      • 1...d4
        • 2.Qxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 3
  • Sets
    • S(a);SBLOCK,XP(G)::S(D)
    • P(c);SBLOCK,XP(G)::B(C)+P(E)
    • P(c);N_GUARD::S(D),XP(b)
    • P(e);N_GUARD::R1(A)
  • Tries
    • Try
      • S(K);
      • Threat
        • DUALS(2)
      • Vars
        • P(c);XP(G)::S(K)
        • B(h);::S(K)
        • S(g);::S(K)
        • P(f);::S(K)
      • Refutation
        • K(d);S_FLIGHT,XS(K)
  • Actual
    • Q(J);XP(b)
    • Threat
      • QAB1(J)
    • Vars
      • B(h);SBLOCK,XS(K)::B(C)+P(E)
      • S(g);SBLOCK,XS(K)::S(D)
      • P(c);XQ(J)::S(D),XP(c)
      • S(a);N_GUARD::QAR1(J),XP(c)
      • P(c);::QAB1(J),XP(c)
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