MESON Chess Problem Database

Problem Display
PID: 171999 (NBn2r1q/2P3r1/4p3/KP1k4/1Q3Pp1/4p1N1/2p5/3b1Bb1 w - - 0 1)

Apro, Laszlo

Die Schwalbe, 1977

NBn2r1q/2P3r1/4p3/KP1k4/1Q3Pp1/4p1N1/2p5/3b1Bb1

#2

9 + 11

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rxc7
      • 2.Sxc7#
    • 1...Sb6
      • 2.Sxb6#
    • 1...Sd6
      • 2.Sb6#
    • 1...Sa7
      • 2.Sb6#
    • 1...Se7
      • 2.Sb6#
    • 1...e2
      • 2.Bg2#
  • Tries
    • 1.Qd2+?
      • 1...Kc5
        • 2.Se4#
      • 1...exd2!
    • 1.Qe4+?
      • 1...Kc5
        • 2.Qe5#
      • 1...Kd6!
  • Keys
    • 1.Ba7!
      • threat
        • 2.Bc4#
        • 2.Qc5#
        • 2.Qd4#
      • 1...Rxc7
        • 2.Sxc7#
      • 1...Rxf4
        • 2.Qc5#
      • 1...Sxa7
        • 2.Sb6#
      • 1...e5
        • 2.Bc4#
      • 1...c1Q
        • 2.Qd4#
      • 1...c1R
        • 2.Qd4#
      • 1...Rg5
        • 2.Bc4#
        • 2.Qc5#
      • 1...Rg6
        • 2.Bc4#
        • 2.Qc5#
      • 1...Rd7
        • 2.Bc4#
        • 2.Qc5#
      • 1...Re7
        • 2.Bc4#
        • 2.Qc5#
      • 1...Rgf7
        • 2.Bc4#
        • 2.Qc5#
      • 1...Rh7
        • 2.Bc4#
        • 2.Qc5#
      • 1...Rgg8
        • 2.Bc4#
        • 2.Qc5#
      • 1...Be2
        • 2.Qc5#
        • 2.Qd4#
      • 1...Sb6
        • 2.Sxb6#
      • 1...Sd6
        • 2.Sb6#
        • 2.Qc5#
        • 2.Qd4#
      • 1...e2
        • 2.Bg2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • R(h);XP(G)::S(H),XR(h)
    • S(i);N_GUARD::S(H),XS(i)
    • S(i);N_GUARD::S(H)
    • P(d);S_CUTB(a)::B(A)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • K(f);P-FLIGHT::S(B)
      • Refutation
        • P(d);XQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • K(f);P-FLIGHT::QAR2(C)
      • Refutation
        • K(f);P-FLIGHT
  • Actual
    • B(I);
    • Threat
      • DUALS(3)
    • Vars
      • R(h);XP(G)::S(H),XR(h)
      • R(j);XP(D)::QAR1(C)
      • S(i);N_GUARD,XB(I)::S(H)
      • P(g);::B(A)
      • P(c);::QAR1(C)
      • S(i);N_GUARD::S(H),XS(i)
      • P(d);S_CUTB(a)::B(A)
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