MESON Chess Problem Database

Problem Display
PID: 92877 (Q5b1/8/5B2/1pp2P2/1k3N2/1q1R2RK/8/2rB4 w - - 0 1)

Koetsheid, Petrus Albertus

Tidskrift for Schack, 1956

Q5b1/8/5B2/1pp2P2/1k3N2/1q1R2RK/8/2rB4

#2

8 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kc4
      • 2.Qe4#
    • 1...Qc4
      • 2.Qa3#
    • 1...Rc4
      • 2.Rxb3#
    • 1...c4
      • 2.Be7#
  • Tries
    • 1.Rxb3+?
      • 1...Kc4
        • 2.Be2#
        • 2.Qe4#
        • 2.Qxg8#
      • 1...Bxb3!
    • 1.Rd4+?
      • 1...Qc4
        • 2.Rb3#
        • 2.Qa3#
      • 1...Rc4
        • 2.Rxb3#
      • 1...Bc4
        • 2.Sd5#
        • 2.Rxb3#
      • 1...c4
        • 2.Be7#
      • 1...cxd4!
    • 1.Qa5+?
      • 1...Kc4
        • 2.Bxb3#
      • 1...Kxa5!
  • Keys
    • 1.Rg4!
      • threat
        • 2.Sd5#
      • 1...Qxd3+
        • 2.Sxd3#
      • 1...Kc4
        • 2.Qe4#
      • 1...Qc4
        • 2.Qa3#
      • 1...Qd5
        • 2.Sxd5#
      • 1...Rc4
        • 2.Rxb3#
      • 1...Bd5
        • 2.Sxd5#
      • 1...c4
        • 2.Be7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(c);P-FLIGHT::QAR2(H)
    • Q(b);N_GUARD,SBLOCK::QAB1(H)
    • R(a);SBLOCK,S_CUTB(f)::R1(B),XQ(b)
    • P(e);OGATEB,SBLOCK::B(G)
  • Tries
    • Try
      • R(B);CHECK,XQ(b)
      • Refutation
        • B(f);XR(B)
    • Try
      • R(B);CHECK,P_SPINR(C)
      • Vars
        • R(a);P_SPINR(a)::R1(C),XQ(b)
        • P(e);P_SPINP(e),S_CUTB(f),S_CUTQ(b),S_CUTR(a)::B(G)
      • Refutation
        • P(e);XR(B)
    • Try
      • Q(H);CHECK
      • Vars
        • K(c);P-FLIGHT::B(A),XQ(b)
      • Refutation
        • K(c);S_FLIGHT,XQ(H)
  • Actual
    • R(C);P_SPINR(B)
    • Threat
      • R(C)+S(E),DCHECK
    • Vars
      • Q(b);CHECK,XR(B)::R(C)+S(E),DCHECK,XQ(b)
      • K(c);P-FLIGHT::QAR2(H)
      • Q(b);N_GUARD,N_PINR(B),SBLOCK::QAB1(H)
      • Q(b);N_PINR(B)::R(C)+S(E),DCHECK,XQ(b)
      • R(a);SBLOCK,S_CUTB(f)::R1(B),XQ(b)
      • B(f);::R(C)+S(E),DCHECK,XB(f)
      • P(e);OGATEB,SBLOCK::B(G)
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