MESON Chess Problem Database

Problem Display
PID: 108418 (B3R1q1/4p2N/1B6/3Pnp2/4kp2/1N1p1r2/K2Qr1P1/4R3 w - - 0 1)

Hirschenson, Aaron

Scacchi e Scienze Applicate 05. TT, 1987

B3R1q1/4p2N/1B6/3Pnp2/4kp2/1N1p1r2/K2Qr1P1/4R3

#2

10 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd5
      • 2.Sg5#
    • 1...Qe6
      • 2.Sg5#
    • 1...Qf7
      • 2.Sg5#
    • 1...Qg5
      • 2.Sxg5#
    • 1...Qxe8
      • 2.Sg5#
    • 1...Qf8
      • 2.Sg5#
    • 1...Qh8
      • 2.Sg5#
    • 1...e6
      • 2.Sf6#
  • Tries
    • 1.Rxe2+?
      • 1...dxe2
        • 2.Sc5#
        • 2.Qd4#
      • 1...Re3!
    • 1.Rxe7?
      • threat
        • 2.Sf6#
      • 1...Qxh7
        • 2.d6#
      • 1...Qe6
        • 2.Sg5#
      • 1...Qf7
        • 2.Sg5#
      • 1...Qg5
        • 2.Sxg5#
        • 2.d6#
      • 1...Qg6
        • 2.d6#
      • 1...Qg7
        • 2.d6#
      • 1...Qf8
        • 2.Sg5#
      • 1...Qh8
        • 2.Sg5#
      • 1...Qxa8+!
    • 1.Qxe2+?
      • 1...Re3
        • 2.Sd2#
      • 1...dxe2!
    • 1.d6+?
      • 1...Qd5
        • 2.Sg5#
      • 1...Sc6!
  • Keys
    • 1.Qb2!
      • threat
        • 2.Sd2#
      • 1...Qxd5
        • 2.Sg5#
      • 1...Sc6
        • 2.Sf6#
      • 1...d2
        • 2.Qd4#
      • 1...Rfe3
        • 2.Sc5#
      • 1...Sc4
        • 2.Sf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 7
  • Sets
    • Q(i);N_GUARD,P_PINS(E),P_SPINQ(i),XP(F)::S(H)
    • Q(i);N_GUARD::S(H)
    • Q(i);N_GUARD::S(H),XQ(i)
    • Q(i);N_GUARD,XR(J)::S(H)
    • P(h);N_GUARD::S(H)
  • Tries
    • Try
      • R(A);CHECK,N_SPINQ(C),XR(a)
      • Refutation
        • R(c);P_SPINR(c)
    • Try
      • R(J);P_PINS(f),XP(h)
      • Threat
        • S(H)
      • Vars
        • Q(i);N_GUARD,XS(H)::B(I)+P(F)
        • Q(i);N_GUARD,N_SPINS(f)::S(H)
        • Q(i);N_GUARD::S(H)
        • Q(i);N_GUARD::B(I)+P(F)
      • Refutation
        • Q(i);CHECK,XB(I)
    • Try
      • Q(C);CHECK,N_SPINQ(C),XR(a)
      • Vars
        • R(c);P_SPINR(c)::S(E)
      • Refutation
        • P(b);P_SPINP(b),XQ(C)
    • Try
      • P(F);CHECK,P_SPINS(E)
      • Vars
        • Q(i);P_SPINQ(i)::S(H)
      • Refutation
        • S(f);P_SPINP(h),P_SPINS(f)
  • Actual
    • Q(C);
    • Threat
      • S(E)
    • Vars
      • Q(i);N_GUARD,P_PINS(E),P_SPINQ(i),XP(F)::S(H)
      • S(f);P_SPINP(h)::S(H)
      • P(b);N_PINQ(C)::QAR1(C)
      • R(c);N_SPINR(a),SBLOCK::S(E)
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