MESON Chess Problem Database

Problem Display
PID: 271045 (3r4/pPPNBpp1/4n3/p2k4/P1R2Pp1/1Q6/2NK2n1/8 w - - 0 1)

Bakker, Peter Arie

Schakend Nederland, 1972

3r4/pPPNBpp1/4n3/p2k4/P1R2Pp1/1Q6/2NK2n1/8

#2

10 + 9

15601 Albrecht-Leiss-Degener Collection 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Ra8
      • 2.bxa8Q#
      • 2.bxa8B#
    • 1...Se1
      • 2.Se3#
    • 1...Se3
      • 2.Sxe3#
    • 1...Sgxf4
      • 2.Se3#
    • 1...Sh4
      • 2.Se3#
    • 1...a6
      • 2.Sb6#
    • 1...g5
      • 2.Sf6#
    • 1...g6
      • 2.Sf6#
  • Tries
    • 1.Qe3?
      • threat
        • 2.Qe4#
      • 1...Kxc4
        • 2.Qd3#
      • 1...Sxe3
        • 2.Sxe3#
      • 1...Sc5
        • 2.Rxc5#
      • 1...Sd4
        • 2.Rc5#
      • 1...Sg5
        • 2.Rc5#
      • 1...f5!
    • 1.Qf3+?
      • 1...Kxc4
        • 2.Qd3#
      • 1...gxf3!
    • 1.b8S?
      • threat
        • 2.Rb4#
        • 2.Rd4#
      • 1...Sd4
        • 2.Rxd4#
      • 1...Sc5
        • 2.Rd4#
      • 1...Se3
        • 2.Sxe3#
        • 2.Rd4#
      • 1...Rxb8!
    • 1.cxd8S?
      • threat
        • 2.Rb4#
        • 2.Rd4#
      • 1...Sd4
        • 2.Rxd4#
      • 1...Se3
        • 2.Sxe3#
        • 2.Rd4#
      • 1...Sc5
        • 2.Rd4#
      • 1...Sxd8!
  • Keys
    • 1.Qb6!
      • threat
        • 2.Qc6#
      • 1...Kxc4
        • 2.Qb5#
      • 1...axb6
        • 2.Sxb6#
      • 1...Sd4
        • 2.Rxd4#
      • 1...Sc5
        • 2.Rd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 7
  • Sets
    • R(i);OGATE::PXR(i)=Q
    • S(a);N_GUARD::S(A)
    • S(a);N_GUARD::S(A),XS(a)
    • S(a);N_GUARD,XP(F)::S(A)
    • P(f);N_GUARD::S(I)
    • P(h);N_GUARD::S(I)
  • Tries
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • K(d);P_PINS(I),S_CUTS(e),S_FLIGHT,XR(E)::QAB1(C)
        • S(a);XQ(C)::S(A),XS(a)
        • S(e);N_GUARD::R1(E),XS(e)
        • S(e);N_GUARD::R1(E)
      • Refutation
        • P(g);
    • Try
      • Q(C);CHECK
      • Vars
        • K(d);P_PINS(I),S_CUTS(e),S_FLIGHT,XR(E)::QAB1(C)
      • Refutation
        • P(b);XQ(C)
    • Try
      • P(G);
      • Threat
        • DUALS(2)
      • Vars
        • S(e);::QAB(C)+R(E),DCHECK,XS(e)
        • S(e);::QAB(C)+R(E),DCHECK
      • Refutation
        • R(i);XS(G)
    • Try
      • P(H);XR(i)
      • Threat
        • DUALS(2)
      • Vars
        • S(e);::QAB(C)+R(E),DCHECK,XS(e)
        • S(e);::QAB(C)+R(E),DCHECK
      • Refutation
        • S(e);XS(H)
  • Actual
    • Q(C);
    • Threat
      • QAB1(C)
    • Vars
      • K(d);P_PINS(I),S_CUTS(e),S_FLIGHT,XR(E)::QAB1(C)
      • P(f);XQ(C)::S(I),XP(f)
      • S(e);N_GUARD::R1(E),XS(e)
      • S(e);N_GUARD::R1(E)
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