MESON Chess Problem Database

Problem Display
PID: 238907 (8/1N1B4/Qp5r/rn1kp3/N2pp2R/pbpP4/8/4K3 w - - 0 1)

Petite, Efren

Norsk Sjakkblad, 1957

8/1N1B4/Qp5r/rn1kp3/N2pp2R/pbpP4/8/4K3

#2

7 + 11

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rxa4
      • 2.Qxb5#
    • 1...Rxh4
      • 2.Sxb6#
    • 1...Rh5
      • 2.Sxb6#
    • 1...Rh7
      • 2.Sxb6#
    • 1...Rh8
      • 2.Sxb6#
    • 1...Bc4
      • 2.dxe4#
    • 1...Sd6
      • 2.Sxb6#
    • 1...Sa7
      • 2.dxe4#
    • 1...Sc7
      • 2.dxe4#
  • Tries
    • 1.Rxh6?
      • threat
        • 2.Sxb6#
        • 2.Bc6#
      • 1...Rxa4
        • 2.Bc6#
        • 2.Qxb5#
      • 1...Rxa6
        • 2.Bc6#
      • 1...Bxa4
        • 2.Bc6#
      • 1...Sd6
        • 2.Sxb6#
        • 2.Rxd6#
      • 1...Sa7
        • 2.Sxb6#
        • 2.Rd6#
      • 1...exd3!
  • Keys
    • 1.Qxb6!
      • threat
        • 2.Qc5#
      • 1...Rxb6
        • 2.Sxb6#
      • 1...Rc6
        • 2.Qxc6#
      • 1...Sd6
        • 2.Qc6#
      • 1...Sa7
        • 2.Qxb3#
      • 1...Sc7
        • 2.Qxb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • R(f);N_GUARD,XS(C)::QAR2(E),XS(g)
    • R(k);N_GUARD,XR(D)::S(C),XP(j)
    • R(k);N_GUARD::S(C),XP(j)
    • B(b);SBLOCK::P(B),XP(e)
    • S(g);S_CUTR(k)::S(C),XP(j)
    • S(g);::P(B),XP(e)
  • Tries
    • Try
      • R(D);XR(k)
      • Threat
        • DUALS(2)
      • Vars
        • R(f);XQ(E)::B(G)
        • B(b);XS(C)::B(G)
      • Refutation
        • P(e);XP(B)
  • Actual
    • Q(E);XP(j)
    • Threat
      • QAR1(E)
    • Vars
      • R(k);XQ(E)::S(C),XR(k)
      • R(k);N_GUARD::QAB1(E),XR(k)
      • S(g);S_CUTR(k)::QAB1(E)
      • S(g);OGATE::QAB(E),XB(b)
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