MESON Chess Problem Database

Problem Display
PID: 261137 (2R1N2b/1P1k1p2/2N2r1p/3n1P2/6BB/5n2/1Q6/K7 w - - 0 1)

Tikkanen, Tapani

1st HM., Neue Zurcher Zeitung, 1984

2R1N2b/1P1k1p2/2N2r1p/3n1P2/6BB/5n2/1Q6/K7

#2

9 + 7

5454 Near Snap 2022
6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Rxf5
      • 2.Bxf5#
    • 1...Rxc6
      • 2.Rd8#
    • 1...Rd6
      • 2.Sb8#
    • 1...Re6
      • 2.Sb8#
    • 1...Rg6
      • 2.Sb8#
    • 1...Se7
      • 2.Sb8#
  • Tries
    • 1.Rc7+?
      • 1...Kxe8
        • 2.b8Q#
        • 2.b8R#
      • 1...Sxc7!
    • 1.Qc3?
      • threat
        • 2.Rd8#
      • 1...Rxf5
        • 2.Bxf5#
      • 1...Sxc3!
    • 1.Qe5?
      • threat
        • 2.Sb8#
      • 1...Rxc6
        • 2.Rd8#
      • 1...Sxe5!
  • Keys
    • 1.Qb5!
      • threat
        • 2.Rd8#
      • 1...Rxf5+
        • 2.Sd4#
      • 1...Rxc6+
        • 2.f6#
      • 1...Rd6+
        • 2.Se5#
      • 1...Re6+
        • 2.Se5#
      • 1...Rg6+
        • 2.Se5#

Anticipated by 11958(1973)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 5
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • R(c);OGATE,P_PINQ(B),P_SPINR(c),XP(E)::B(C),XR(c)
    • R(c);P_PINQ(B),SBLOCK,XS(F)::R1(H)
    • R(c);P_PINQ(B)::S(F)
    • S(b);SBLOCK::S(F)
  • Tries
    • Try
      • R(H);CHECK
      • Vars
        • K(e);S_CUTS(b),S_FLIGHT,XS(I)::P=Q
      • Refutation
        • S(b);XR(H)
    • Try
      • Q(B);
      • Threat
        • R1(H)
      • Vars
        • R(c);OGATE,P_PINQ(B),P_SPINR(c),XP(E)::B(C),XR(c)
      • Refutation
        • S(b);XQ(B)
    • Try
      • Q(B);
      • Threat
        • S(F)
      • Vars
        • R(c);P_PINQ(B),SBLOCK,XS(F)::R1(H)
      • Refutation
        • S(a);XQ(B)
  • Actual
    • Q(B);
    • Threat
      • R1(H)
    • Vars
      • R(c);CHECK,N_GUARD,P_SPINR(c),XP(E)::QAB(B)+S(F)
      • R(c);CHECK,OGATE,P_SPINR(c),XS(F)::B(C)+P(E)
      • R(c);CHECK::QAB(B)+S(F),DCHECK
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