MESON Chess Problem Database

Problem Display
PID: 205706 (8/3p2R1/4k3/2Q2p2/2n2K2/8/8/8 w - - 0 1)

Schonberger, Tibor

Magyar Sakkvilag, 1925

8/3p2R1/4k3/2Q2p2/2n2K2/8/8/8

#2

3 + 4

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kf6
      • 2.Qe7#
    • 1...Sb2
      • 2.Qe5#
    • 1...Sd2
      • 2.Qe5#
    • 1...Sa3
      • 2.Qe5#
    • 1...Se3
      • 2.Qe5#
    • 1...Sa5
      • 2.Qe5#
    • 1...Se5
      • 2.Qxe5#
    • 1...Sb6
      • 2.Qe5#
    • 1...Sd6
      • 2.Qe5#
    • 1...d5
      • 2.Qe7#
    • 1...d6
      • 2.Qxf5#
  • Tries
    • 1.Kg5?
      • threat
        • 2.Re7#
      • 1...d6
        • 2.Qxf5#
      • 1...Sd6!
    • 1.Rxd7?
      • threat
        • 2.Qe7#
        • 2.Qxf5#
      • 1...Kf6
        • 2.Qxf5#
      • 1...Se3
        • 2.Qd6#
        • 2.Qe7#
        • 2.Qc6#
      • 1...Se5
        • 2.Qd6#
        • 2.Qe7#
      • 1...Sd6
        • 2.Qxd6#
      • 1...Kxd7!
    • 1.Qxc4+?
      • 1...Kf6
        • 2.Qf7#
      • 1...d5
        • 2.Qa6#
        • 2.Qc6#
      • 1...Kd6!
    • 1.Qd5+?
      • 1...Kf6
        • 2.Qf7#
      • 1...Kxd5!
  • Keys
    • 1.Rh7!
      • 1...Kf6
        • 2.Qxf5#
      • 1...Sb2
        • 2.Qe5#
      • 1...Sd2
        • 2.Qe5#
      • 1...Sa3
        • 2.Qe5#
      • 1...Se3
        • 2.Qe5#
      • 1...Sa5
        • 2.Qe5#
      • 1...Se5
        • 2.Qxe5#
      • 1...Sb6
        • 2.Qe5#
      • 1...Sd6
        • 2.Qe5#
      • 1...d5
        • 2.Qe7#
      • 1...d6
        • 2.Qxf5#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • K(c);P-FLIGHT::QAB1(B)
    • S(a);N_GUARD::QAR1(B)
    • S(a);N_GUARD::QAR1(B),XS(a)
    • P(d);SBLOCK::QAR1(B)
    • P(d);SBLOCK::QAB1(B),XP(b)
  • Tries
    • Try
      • K(A);S_FLIGHT
      • Threat
        • R1(C)
      • Vars
        • P(d);SBLOCK::QAB1(B),XP(b)
      • Refutation
        • S(a);
    • Try
      • R(C);XP(d)
      • Threat
        • DUALS(2)
      • Vars
        • K(c);P-FLIGHT::QAR1(B),XP(b)
        • S(a);N_GUARD::QAR1(B),XS(a)
      • Refutation
        • K(c);S_FLIGHT,XR(C)
    • Try
      • Q(B);CHECK,XS(a)
      • Vars
        • K(c);OGATE,P-FLIGHT::QAR1(B)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);OGATE,P-FLIGHT::QAR1(B)
      • Refutation
        • K(c);S_FLIGHT,XQ(B)
  • Actual
    • R(C);
    • Vars
      • K(c);P-FLIGHT::QAR1(B),XP(b)
      • S(a);N_GUARD::QAR1(B)
      • S(a);N_GUARD::QAR1(B),XS(a)
      • P(d);SBLOCK::QAR1(B)
      • P(d);SBLOCK::QAB1(B),XP(b)
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