MESON Chess Problem Database

Problem Display
PID: 172000 (8/5p2/2N2p2/K1p2RpQ/4kp2/R1p4q/2Nb1PP1/1B6 w - - 0 1)

Apro, Laszlo

9th Comm., Probleemblad, 1969

8/5p2/2N2p2/K1p2RpQ/4kp2/R1p4q/2Nb1PP1/1B6

#2

9 + 9

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Kd3
      • 2.Se3#
    • 1...Kxf5
      • 2.S2d4#
    • 1...Qxf5
      • 2.Qf3#
  • Tries
    • 1.Se1+?
      • 1...Qd3
        • 2.Bxd3#
      • 1...c2+!
    • 1.S2b4+?
      • 1...Qd3
        • 2.Bxd3#
      • 1...c2!
    • 1.S2d4+?
      • 1...Qd3
        • 2.Qf3#
      • 1...c2+!
    • 1.Ra4+?
      • 1...Kd3
        • 2.Se1#
        • 2.Rd5#
      • 1...Kxf5
        • 2.S2d4#
      • 1...c4!
    • 1.Re5+?
      • 1...Kd3
        • 2.Se3#
        • 2.Qe2#
      • 1...fxe5!
    • 1.Qf3+?
      • 1...Kxf5
        • 2.S2d4#
      • 1...Qxf3!
  • Keys
    • 1.Qxf7!
      • threat
        • 2.Qd5#
      • 1...Kd3
        • 2.S2d4#
      • 1...Kxf5
        • 2.Se3#
      • 1...Qxf5
        • 2.Qc4#
      • 1...Qd3
        • 2.Qe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(d);P_SPINP(b),S_FLIGHT::B(A)+S(B)
    • K(d);P_SPINP(g),S_FLIGHT,XR(G)::B(A)+S(B),DCHECK
    • Q(c);N_GUARD,SBLOCK,XR(G)::QAB1(H)
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • Q(c);N_GUARD,P_SPINQ(c)::B(A),XQ(c)
      • Refutation
        • P(b);CHECK,P_SPINP(b)
    • Try
      • S(B);CHECK
      • Vars
        • Q(c);N_GUARD,P_SPINQ(c)::B(A),XQ(c)
      • Refutation
        • P(b);P_PINS(B),P_SPINP(b)
    • Try
      • S(B);CHECK
      • Vars
        • Q(c);P_SPINQ(c)::QAB1(H)
      • Refutation
        • P(b);CHECK,P_SPINP(b)
    • Try
      • R(E);CHECK
      • Vars
        • K(d);P_SPINP(g),S_FLIGHT,XR(G)::B(A)+S(B),DCHECK
      • Refutation
        • P(f);P_SPINP(f)
    • Try
      • R(G);CHECK
      • Refutation
        • P(h);XR(G)
    • Try
      • Q(H);CHECK
      • Vars
        • K(d);P_SPINP(e),S_FLIGHT,XR(G)::B(A)+S(B),DCHECK
      • Refutation
        • Q(c);XQ(H)
  • Actual
    • Q(H);XP(i)
    • Threat
      • QAB1(H)
    • Vars
      • K(d);P_SPINP(b),S_FLIGHT::B(A)+S(B)
      • K(d);P_SPINP(h),S_FLIGHT,XR(G)::B(A)+S(B),DCHECK
      • Q(c);SBLOCK,XR(G)::QAR2(H)
      • Q(c);SBLOCK::QAR2(H)
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