MESON Chess Problem Database

Problem Display
PID: 157537 (8/1K6/RnRN3n/r2Bkp2/3p1p1B/3Q4/8/4b3 w - - 0 1)

Petite, Efren

Israel Problemists' Association, 1954

8/1K6/RnRN3n/r2Bkp2/3p1p1B/3Q4/8/4b3

#2

7 + 8

15148 Sadier Collection 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd5
      • 2.Qe2#
    • 1...Sxd5
      • 2.Sc4#
    • 1...Sg4
      • 2.Qxf5#
    • 1...Sf7
      • 2.Qxf5#
    • 1...Sg8
      • 2.Qxf5#
  • Tries
    • 1.Sc4+?
      • 1...Kxd5
        • 2.Qf3#
      • 1...Sxc4!
    • 1.Sf7+?
      • 1...Kxd5
        • 2.Qf3#
      • 1...Sxf7!
  • Keys
    • 1.Sxf5!
      • threat
        • 2.Qe4#
      • 1...Kxd5
        • 2.Qxd4#
      • 1...Rxd5
        • 2.Bf6#
      • 1...Sxd5
        • 2.Re6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • R(d);SBLOCK,XB(C)::QAR(A)
    • S(g);N_GUARD,SBLOCK,XB(C)::S(F)
    • S(h);N_GUARD::QAR1(A),XP(f)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • K(e);P-FLIGHT,P_SPINP(b),XB(C)::QAB(A)
      • Refutation
        • S(g);XS(F)
    • Try
      • S(F);CHECK
      • Vars
        • K(e);P-FLIGHT,P_SPINP(b),XB(C)::QAB(A)
      • Refutation
        • S(h);XS(F)
  • Actual
    • S(F);XP(f)
    • Threat
      • QAR1(A)
    • Vars
      • K(e);P-FLIGHT,P_SPINP(b),XB(C)::QAR1(A),XP(b)
      • R(d);SBLOCK,XB(C)::B(B)
      • S(g);SBLOCK,XB(C)::R1(E)
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