MESON Chess Problem Database

Problem Display
PID: 176353 (br2k1K1/RNp1P1nR/1N6/6P1/4Q3/8/B7/5r2 w - - 0 1)

Hannelius, Jan Ingvar

Schach-Echo, 1972

br2k1K1/RNp1P1nR/1N6/6P1/4Q3/8/B7/5r2

#2

9 + 6

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Bf7#
    • 1...Rb1
      • 2.Bf7#
    • 1...Rc1
      • 2.Bf7#
    • 1...Rd1
      • 2.Bf7#
    • 1...Re1
      • 2.Bf7#
    • 1...Rg1
      • 2.Bf7#
    • 1...Rh1
      • 2.Bf7#
    • 1...Rf7
      • 2.Bxf7#
    • 1...Rf8+
      • 2.exf8Q#
      • 2.exf8R#
    • 1...Rd8
      • 2.exd8Q#
      • 2.exd8R#
    • 1...Sf5
      • 2.Bf7#
      • 2.Qc6#
    • 1...Sh5
      • 2.Qc6#
    • 1...Se6
      • 2.Qc6#
    • 1...cxb6
      • 2.Sd6#
    • 1...c5
      • 2.Sd6#
    • 1...c6
      • 2.Sd6#
  • Tries
    • 1.Qd5?
      • threat
        • 2.Qd7#
      • 1...Rf8+
        • 2.exf8Q#
      • 1...cxb6
        • 2.Sd6#
      • 1...Rd1
        • 2.Qf7#
      • 1...Rd8
        • 2.Qxd8#
        • 2.exd8Q#
      • 1...Kxe7+!
    • 1.Qg6+?
      • 1...Rf7
        • 2.Qxf7#
      • 1...Kxe7+!
    • 1.Qa4+?
      • 1...c6
        • 2.Sd6#
      • 1...Kxe7+!
    • 1.Qe6?
      • threat
        • 2.Qd7#
      • 1...Rf8+
        • 2.exf8Q#
        • 2.exf8R#
      • 1...cxb6
        • 2.Sd6#
      • 1...Rd1
        • 2.Qf7#
      • 1...Rd8
        • 2.exd8Q#
        • 2.exd8R#
      • 1...Sxe6!
  • Keys
    • 1.Be6!
      • threat
        • 2.Bd7#
      • 1...Kxe7+
        • 2.Bc8#
      • 1...Rf8+
        • 2.exf8Q#
      • 1...Sxe6
        • 2.Qc6#
      • 1...cxb6
        • 2.Sd6#
      • 1...Rd1
        • 2.Bf7#
      • 1...Rd8
        • 2.exd8Q#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 10
  • Sets
    • R(a);N_GUARD::B(A)
    • R(a);N_GUARD::B(A),XR(a)
    • R(a);CHECK,OGATE::PXR(a)=Q
    • R(e);OGATE::PXR(e)=Q
    • S(c);::QAB(B)
    • P(b);N_GUARD,XS(D)::S(F)
    • P(b);N_GUARD::S(F)
  • Tries
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Vars
        • R(a);CHECK,OGATE::PXR(a)=Q
        • P(b);N_GUARD,XS(D)::S(F)
        • R(a);N_GUARD::QAB1(B)
      • Refutation
        • K(f);CHECK,P-FLIGHT,P_SPINS(c),XP(G)
    • Try
      • Q(B);CHECK
      • Vars
        • R(a);N_GUARD,P_SPINR(a)::QAB1(B),XR(a)
      • Refutation
        • K(f);CHECK,P-FLIGHT,P_SPINS(c),XP(G)
    • Try
      • Q(B);CHECK
      • Vars
        • P(b);P_SPINP(b)::S(F)
      • Refutation
        • K(f);CHECK,P-FLIGHT,P_SPINS(c),XP(G)
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Vars
        • R(a);CHECK,OGATE::PXR(a)=Q
        • P(b);N_GUARD,XS(D)::S(F)
        • R(a);N_GUARD::QAB1(B)
        • R(e);OGATE::PXR(e)=Q
      • Refutation
        • S(c);XQ(B)
  • Actual
    • B(A);
    • Threat
      • B(A)
    • Vars
      • K(f);CHECK,OGATEB,P-FLIGHT,P_SPINS(c),XP(G)::QAR(B)+B(A)
      • R(a);CHECK,OGATE::PXR(a)=Q
      • S(c);XB(A)::QAB(B)
      • P(b);N_GUARD,XS(D)::S(F)
      • R(a);N_GUARD::B(A)
      • R(e);OGATE::PXR(e)=Q
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