MESON Chess Problem Database

Problem Display
PID: 11657 (8/8/p7/6p1/1Nppn1R1/K1k1BNQ1/3n1b1R/1b6 w - - 0 1)

Valve, Leo Erland

Schach-Echo, 1970

8/8/p7/6p1/1Nppn1R1/K1k1BNQ1/3n1b1R/1b6

#2

7 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Be1
      • 2.Bxd4#
    • 1...Bxg3
      • 2.Bxd4#
    • 1...Sxg3
      • 2.Bxd2#
    • 1...Sc5
      • 2.Bxd2#
    • 1...Sd6
      • 2.Bxd2#
    • 1...Sf6
      • 2.Bxd2#
    • 1...dxe3
      • 2.Qe5#
    • 1...d3
      • 2.Qe5#
  • Tries
    • 1.Sxd4?
      • threat
        • 2.Se2#
      • 1...Bd3
        • 2.Sa2#
        • 2.Sd5#
      • 1...Sxg3!
    • 1.Qxf2?
      • threat
        • 2.Bxd4#
      • 1...Sxf3
        • 2.Qb2#
      • 1...Sb3
        • 2.Qb2#
      • 1...d3
        • 2.Bd4#
      • 1...dxe3!
  • Keys
    • 1.Se1!
      • threat
        • 2.Sd5#
      • 1...Bxe1
        • 2.Bxd2#
      • 1...dxe3
        • 2.Qe5#
      • 1...Sf6
        • 2.Bxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 5
  • Sets
    • B(c);N_GUARD::B(C),XP(f)
    • B(c);N_GUARD,XQ(E)::B(C),XP(f)
    • S(g);N_GUARD,XQ(E)::B(C),XS(b)
    • S(g);N_GUARD::B(C),XS(b)
    • P(f);OGATEB,XB(C)::QAB(E)
    • P(f);OGATEB::QAB(E)
  • Tries
    • Try
      • S(D);XP(f)
      • Threat
        • S(D)
      • Refutation
        • S(g);XQ(E)
    • Try
      • Q(E);XB(c)
      • Threat
        • B(C),XP(f)
      • Vars
        • S(b);OGATE,XS(D)::QAB1(E)
        • S(b);OGATE::QAB1(E)
        • P(f);::B(C)
      • Refutation
        • P(f);XB(C)
  • Actual
    • S(D);
    • Threat
      • S(F)
    • Vars
      • B(c);XS(D)::QAR(E)+B(C),DCHECK,XS(b)
      • P(f);OGATEB,P_SPINP(f),XB(C)::QAB(E)
      • S(g);::QAR(E)+B(C),DCHECK,XP(f)
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