MESON Chess Problem Database

Problem Display
PID: 205584 (3nBb2/1r1n1r2/2R5/1N1k1p2/1p1P1P2/1P6/2Q2B2/5K2 w - - 0 1)

Richenberg, LJ

The Observer, 1953

(First published on Sun Mar 22 1953)

3nBb2/1r1n1r2/2R5/1N1k1p2/1p1P1P2/1P6/2Q2B2/5K2

#2

9 + 8

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rb6
      • 2.Sc7#
    • 1...Rc7
      • 2.Sxc7#
    • 1...Rb8
      • 2.Sc7#
    • 1...Re7
      • 2.Rd6#
    • 1...Bd6
      • 2.Rxd6#
    • 1...Bh6
      • 2.Rd6#
    • 1...Bg7
      • 2.Rd6#
    • 1...Sf6
      • 2.Qxf5#
    • 1...Sxc6
      • 2.Bxf7#
  • Tries
    • 1.Bxf7+?
      • 1...Se6
        • 2.Bxe6#
      • 1...Sxf7!
    • 1.Qe2?
      • threat
        • 2.Qf3#
      • 1...Sxc6
        • 2.Bxf7#
      • 1...Re7
        • 2.Rd6#
      • 1...Bd6
        • 2.Rxd6#
      • 1...Sc5
        • 2.Qe5#
      • 1...Se5
        • 2.Qxe5#
      • 1...Sf6
        • 2.Qe5#
      • 1...Kxc6!
  • Keys
    • 1.Qd3!
      • threat
        • 2.Qf3#
      • 1...Kxc6
        • 2.d5#
      • 1...Sxc6
        • 2.Bxf7#
      • 1...Bd6
        • 2.Rxd6#
      • 1...Re7
        • 2.Rd6#
      • 1...Sc5
        • 2.dxc5#
      • 1...Se5
        • 2.dxe5#
      • 1...Sf6
        • 2.Qxf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • R(d);N_GUARD::S(G)
    • R(d);N_GUARD::S(G),XR(d)
    • R(f);S_CUTB(h)::R1(H)
    • B(h);N_GUARD::R1(H),XB(h)
    • B(h);N_GUARD::R1(H)
    • S(e);N_GUARD,S_CUTR(f)::QAR2(B),XP(c)
    • S(g);N_GUARD,XR(H)::B(I),XR(f)
  • Tries
    • Try
      • B(I);CHECK,XR(f)
      • Vars
        • S(g);N_GUARD,P_SPINS(g)::B(I),XS(g)
      • Refutation
        • S(g);XB(I)
    • Try
      • Q(B);
      • Threat
        • QAB(B)
      • Vars
        • S(g);N_GUARD,SBLOCK,XR(H)::B(I),XR(f)
        • R(f);S_CUTB(h)::R1(H)
        • B(h);N_GUARD::R1(H),XB(h)
        • S(e);N_GUARD::QAR1(B)
        • S(e);N_GUARD::QAR1(B),XS(e)
      • Refutation
        • K(b);P_SPINS(e),S_FLIGHT,XR(H)
  • Actual
    • Q(B);
    • Threat
      • QAB(B)
    • Vars
      • K(b);OGATE,P_SPINS(e),S_FLIGHT,XR(H)::P(E)
      • S(g);N_GUARD,SBLOCK,XR(H)::B(I),XR(f)
      • B(h);N_GUARD::R1(H),XB(h)
      • R(f);S_CUTB(h)::R1(H)
      • S(e);OGATE::QAR(B)+P(E),XS(e)
      • S(e);N_GUARD,S_CUTR(f)::QAR2(B),XP(c)
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