MESON Chess Problem Database

Problem Display
PID: 97954 (B7/1R6/2R5/7N/5qp1/3b1krp/3P1NnK/4BQ1n w - - 0 1)

Hermanson, Halvar

Problemas, 1969

B7/1R6/2R5/7N/5qp1/3b1krp/3P1NnK/4BQ1n

#2

9 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Be4
      • 2.Sxh1#
  • Tries
    • 1.Rc3?
      • threat
        • 2.Rf7#
      • 1...Qxd2
        • 2.Re7#
      • 1...Qc7
        • 2.Rbxc7#
      • 1...Qe4
        • 2.Sxh1#
      • 1...Qf7
        • 2.Rxf7#
      • 1...Se3!
    • 1.Rf6?
      • threat
        • 2.Rb3#
      • 1...Bxf1
        • 2.Re7#
      • 1...Be4
        • 2.Sxh1#
      • 1...Bb5
        • 2.Rxb5#
      • 1...Se3
        • 2.Rxf4#
      • 1...Qxf6!
    • 1.Rb3?
      • threat
        • 2.Rf6#
      • 1...Qxd2
        • 2.Re6#
      • 1...Qd6
        • 2.Rxd6#
      • 1...Qe4
        • 2.Sxh1#
      • 1...Qf6
        • 2.Rd6#
        • 2.Re6#
        • 2.Rxf6#
      • 1...Se3!
  • Keys
    • 1.Rf7!
      • threat
        • 2.Rc3#
      • 1...Qxf7
        • 2.Rf6#
      • 1...Bxf1
        • 2.Re6#
      • 1...Se3
        • 2.Rxf4#
      • 1...Bc4
        • 2.Rxc4#
      • 1...Be4
        • 2.Sxh1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • B(c);N_GUARD,SBLOCK::QAR(B)+S(D),XS(a)
  • Tries
    • Try
      • R(G);P_PINB(c)
      • Threat
        • B(I)+R(H)
      • Vars
        • Q(g);N_GUARD,XP(C)::B(I)+R(H)
        • Q(g);N_GUARD::B(I)+R(H),XQ(g)
        • Q(g);SBLOCK::QAR(B)+S(D),XS(a)
        • Q(g);::B(I)+R(H),DCHECK,XQ(g)
      • Refutation
        • S(b);N_SPINB(c)
    • Try
      • R(G);P_PINQ(g)
      • Threat
        • B(I)+R(H)
      • Vars
        • B(c);N_GUARD,XQ(B)::B(I)+R(H)
        • B(c);N_GUARD,SBLOCK::QAR(B)+S(D),XS(a)
        • B(c);N_GUARD::B(I)+R(H),XB(c)
        • S(b);N_GUARD::R1(G),XQ(g)
      • Refutation
        • Q(g);N_SPINQ(g),XR(G)
    • Try
      • R(H);P_PINB(c)
      • Threat
        • B(I)+R(G)
      • Vars
        • Q(g);N_GUARD,XP(C)::B(I)+R(G)
        • Q(g);N_GUARD::B(I)+R(G),XQ(g)
        • Q(g);SBLOCK::QAR(B)+S(D),XS(a)
      • Refutation
        • S(b);N_SPINB(c)
  • Actual
    • R(H);P_PINQ(g)
    • Threat
      • B(I)+R(G)
    • Vars
      • Q(g);N_SPINQ(g),XR(H)::B(I)+R(G),DCHECK
      • B(c);N_GUARD,XQ(B)::B(I)+R(G)
      • S(b);N_GUARD::R1(H),XQ(g)
      • B(c);N_GUARD::B(I)+R(G),XB(c)
      • B(c);N_GUARD,SBLOCK::QAR(B)+S(D),XS(a)
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