MESON Chess Problem Database

Problem Display
PID: 22203 (2B2R2/8/r1p1N1p1/1pPPkPBb/4p3/8/1Nn1R1n1/3Q3K w - - 0 1)

Grevlund, Per

2nd Place, Postsjakk, 1973

2B2R2/8/r1p1N1p1/1pPPkPBb/4p3/8/1Nn1R1n1/3Q3K

#2

11 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Sa1
      • 2.Qd4#
    • 1...Sce1
      • 2.Qd4#
    • 1...Sa3
      • 2.Qd4#
    • 1...Sce3
      • 2.Qd4#
    • 1...Sb4
      • 2.Qd4#
    • 1...Sd4
      • 2.Qxd4#
    • 1...Sge1
      • 2.Bf4#
    • 1...Sge3
      • 2.Bf4#
    • 1...Sf4
      • 2.Bxf4#
    • 1...Sh4
      • 2.Bf4#
    • 1...b4
      • 2.Sc4#
    • 1...cxd5
      • 2.Sd3#
    • 1...gxf5
      • 2.Bf6#
  • Tries
    • 1.Sf4?
      • threat
        • 2.Re8#
      • 1...Sxf4
        • 2.Bf6#
      • 1...cxd5
        • 2.Qxd5#
      • 1...gxf5
        • 2.Rxf5#
      • 1...Sd4
        • 2.Sbd3#
      • 1...Ra7!
    • 1.Sd8?
      • threat
        • 2.Sf7#
        • 2.Re8#
      • 1...cxd5
        • 2.Sf7#
      • 1...gxf5
        • 2.Rxf5#
      • 1...e3
        • 2.Re8#
      • 1...Ra7
        • 2.Sxc6#
      • 1...Sf4
        • 2.Sf7#
        • 2.Bf6#
      • 1...Sd4!
    • 1.Be7?
      • threat
        • 2.Bd6#
      • 1...cxd5
        • 2.Sd3#
      • 1...Sd4
        • 2.Qxd4#
      • 1...e3!
  • Keys
    • 1.Sc7!
      • threat
        • 2.Re8#
      • 1...cxd5
        • 2.Qxd5#
      • 1...gxf5
        • 2.Rxf5#
      • 1...Sd4
        • 2.Sd3#
      • 1...Sf4
        • 2.Bf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 0
    • REMOVED MATES = 9
  • Sets
    • S(a);N_GUARD::QAB1(A)
    • S(a);N_GUARD,N_SPINP(c)::QAB1(A)
    • S(a);N_GUARD::QAB1(A),XS(a)
    • S(b);N_GUARD::B(H)
    • S(b);N_GUARD,N_SPINP(c)::B(H)
    • S(b);N_GUARD::B(H),XS(b)
    • P(d);N_GUARD::S(C)
    • P(h);SBLOCK,XP(F)::S(C)
    • P(i);SBLOCK,XP(G)::B(H)
  • Tries
    • Try
      • S(I);
      • Threat
        • R(K)
      • Vars
        • S(b);SBLOCK,XS(I)::B(H)
        • P(h);OGATE,XP(F)::QAR1(A),XP(h)
        • P(i);OGATE,XP(G)::R1(K),XP(i)
        • S(a);SBLOCK::S(C)
      • Refutation
        • R(g);
    • Try
      • S(I);
      • Threat
        • DUALS(2)
      • Vars
        • P(h);XP(F)::S(I)
        • P(i);OGATE,XP(G)::R1(K),XP(i)
        • P(c);::R(K)
        • R(g);N_GUARD::S(I),XP(h)
      • Refutation
        • S(a);
    • Try
      • B(H);
      • Threat
        • B(H)
      • Vars
        • P(h);SBLOCK,XP(F)::S(C)
        • S(a);N_GUARD::QAB1(A),XS(a)
      • Refutation
        • P(c);
  • Actual
    • S(I);
    • Threat
      • R(K)
    • Vars
      • P(h);OGATE,XP(F)::QAR1(A),XP(h)
      • P(i);OGATE,XP(G)::R1(K),XP(i)
      • S(a);SBLOCK::S(C)
      • S(b);SBLOCK::B(H)
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