MESON Chess Problem Database

Problem Display
PID: 274532 (4n1K1/R1b4B/2N2kNp/1pp2P1P/3rn1PP/8/3r4/B1Q1R3 w - - 0 1)

Groothoff, JG

Schakend Nederland, 1968

4n1K1/R1b4B/2N2kNp/1pp2P1P/3rn1PP/8/3r4/B1Q1R3

#2

12 + 9

15601 Albrecht-Leiss-Degener Collection 2024

SOLUTION

  • SOUND
  • Sets
    • 1...Bh2
      • 2.Rf7#
    • 1...Bg3
      • 2.Rf7#
    • 1...Bf4
      • 2.Rf7#
    • 1...Ba5
      • 2.Rf7#
    • 1...Be5
      • 2.Rf7#
    • 1...Bb6
      • 2.Rf7#
    • 1...Bd6
      • 2.Rf7#
    • 1...Bb8
      • 2.Rf7#
    • 1...Bd8
      • 2.Rf7#
    • 1...Sf2
      • 2.Re6#
    • 1...Sc3
      • 2.Re6#
    • 1...Sg3
      • 2.Re6#
    • 1...S4d6
      • 2.Re6#
  • Tries
    • 1.Sb8?
      • threat
        • 2.Sd7#
      • 1...Bxb8
        • 2.Rf7#
      • 1...Be5
        • 2.Rf7#
      • 1...Sc3
        • 2.Re6#
      • 1...Rb2!
    • 1.Sf4?
      • threat
        • 2.Sd5#
      • 1...Bxf4
        • 2.Rf7#
      • 1...Be5
        • 2.Rf7#
      • 1...Sc3
        • 2.Re6#
      • 1...Rb2!
    • 1.Sge5?
      • threat
        • 2.Sd7#
      • 1...Bxe5
        • 2.Rf7#
      • 1...Rb2
        • 2.Qxh6#
      • 1...Rd7
        • 2.Sxd7#
      • 1...Sc3!
    • 1.Sge7?
      • threat
        • 2.Sd5#
      • 1...Rb2
        • 2.Qxh6#
      • 1...Sc3
        • 2.Re6#
      • 1...Be5!
    • 1.Qxc5?
      • threat
        • 2.Qe7#
        • 2.Qf8#
      • 1...Bd6
        • 2.Rf7#
      • 1...Bd8
        • 2.Rf7#
        • 2.Qf8#
        • 2.Qe5#
      • 1...Sg5
        • 2.Qe7#
      • 1...S4d6
        • 2.Re6#
        • 2.Qe5#
      • 1...S8d6
        • 2.Qe5#
      • 1...Sxc5!
  • Keys
    • 1.Sf8!
      • threat
        • 2.Sd7#
      • 1...Rb2
        • 2.Qxh6#
      • 1...Be5
        • 2.Rf7#
      • 1...Sc3
        • 2.Re6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 11
  • Sets
    • B(h);OGATE::R1(J)
    • B(h);N_SPINR(b),OGATE::R1(J)
    • S(c);OGATE::R1(C)
    • S(c);N_SPINR(b),OGATE::R1(C)
  • Tries
    • Try
      • S(H);
      • Threat
        • S(H)
      • Vars
        • B(h);OGATE,XS(H)::R1(J)
        • B(h);N_SPINR(b),OGATE::R1(J)
        • S(c);N_SPINR(b),OGATE::R1(C)
      • Refutation
        • R(a);N_SPINR(b)
    • Try
      • S(I);
      • Threat
        • S(I)
      • Vars
        • B(h);OGATE,XS(I)::R1(J)
        • B(h);N_SPINR(b),OGATE::R1(J)
        • S(c);N_SPINR(b),OGATE::R1(C)
      • Refutation
        • R(a);N_SPINR(b)
    • Try
      • S(I);N_PINR(b)
      • Threat
        • S(I)
      • Vars
        • B(h);OGATE,XS(I)::R1(J)
        • R(a);OGATE::QAR2(B),XP(g)
        • R(b);::B(A)+S(I),DCHECK,XR(b)
      • Refutation
        • S(c);
    • Try
      • S(I);
      • Threat
        • S(I)
      • Vars
        • R(a);N_SPINR(b),OGATE::QAR2(B),XP(g)
        • S(c);N_SPINR(b),OGATE::R1(C)
      • Refutation
        • B(h);N_SPINR(b)
    • Try
      • Q(B);XP(e)
      • Threat
        • DUALS(2)
      • Vars
        • B(h);OGATE::R1(J)
        • S(c);::QAB1(B)
        • S(i);S_CUTB(h)::QAB1(B)
      • Refutation
        • S(c);XQ(B)
  • Actual
    • S(I);
    • Threat
      • S(I)
    • Vars
      • R(a);N_SPINR(b),OGATE::QAR2(B),XP(g)
      • B(h);N_SPINR(b),OGATE::R1(J)
      • S(c);N_SPINR(b),OGATE::R1(C)
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