MESON Chess Problem Database

Problem Display
PID: 225681 (BN4K1/7R/Pp1k4/2Nr1p2/1p3P2/8/5p2/Q7 w - - 0 1)

Petkov, Petko Andonov

Comm., Praca, 1958

BN4K1/7R/Pp1k4/2Nr1p2/1p3P2/8/5p2/Q7

#2

8 + 6

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rd1
      • 2.Qe5#
    • 1...Rd2
      • 2.Qe5#
    • 1...Rd3
      • 2.Qe5#
    • 1...Rd4
      • 2.Qxd4#
    • 1...Rxc5
      • 2.Qf6#
    • 1...Re5
      • 2.Qxe5#
    • 1...bxc5
      • 2.Qf6#
  • Tries
    • 1.Se4+?
      • 1...Ke6
        • 2.Qf6#
      • 1...fxe4!
    • 1.Qc3?
      • threat
        • 2.Rd7#
      • 1...Rxc5
        • 2.Qf6#
      • 1...bxc5
        • 2.Qf6#
      • 1...bxc3!
    • 1.Qd4?
      • threat
        • 2.Rd7#
        • 2.Qxd5#
      • 1...bxc5
        • 2.Qf6#
        • 2.Qxd5#
      • 1...Rxd4!
    • 1.Qe5+?
      • 1...Kxc5
        • 2.Qxd5#
      • 1...Rxe5!
    • 1.Qg7?
      • threat
        • 2.Qf8#
        • 2.Qc7#
        • 2.Qe7#
      • 1...Rxc5
        • 2.Rh6#
        • 2.Qf6#
        • 2.Qh6#
        • 2.Qg6#
        • 2.Qd7#
        • 2.Qe7#
      • 1...bxc5
        • 2.Rh6#
        • 2.Qf6#
        • 2.Qh6#
        • 2.Qg6#
        • 2.Qd7#
        • 2.Qe7#
      • 1...Re5
        • 2.Qxe5#
        • 2.Qc7#
      • 1...Kxc5!
    • 1.Qa2?
      • threat
        • 2.Qxd5#
      • 1...Kxc5
        • 2.Qxd5#
      • 1...Rxc5
        • 2.Rd7#
      • 1...Rd1
        • 2.Sb7#
      • 1...Rd2
        • 2.Sb7#
      • 1...Rd3
        • 2.Sb7#
      • 1...Rd4
        • 2.Sb7#
      • 1...Re5
        • 2.Sb7#
      • 1...b3!
  • Keys
    • 1.Qh1!
      • threat
        • 2.Qxd5#
      • 1...Kxc5
        • 2.Qxd5#
      • 1...Rxc5
        • 2.Qh6#
      • 1...Rd1
        • 2.Qc6#
      • 1...Rd2
        • 2.Qc6#
      • 1...Rd3
        • 2.Qc6#
      • 1...Rd4
        • 2.Qc6#
      • 1...Re5
        • 2.Qc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 6
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • R(c);N_GUARD::QAB1(A)
    • R(c);OGATEB::QAR2(A),XR(c)
    • R(c);SBLOCK,XS(C)::QAR2(A)
    • R(c);N_GUARD::QAB1(A),XR(c)
    • P(e);SBLOCK,XS(C)::QAR2(A)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(f);P-FLIGHT::QAR1(A)
      • Refutation
        • P(d);XS(C)
    • Try
      • Q(A);
      • Threat
        • R1(E)
      • Vars
        • R(c);SBLOCK,XS(C)::QAR2(A)
        • P(e);SBLOCK,XS(C)::QAR2(A)
      • Refutation
        • P(b);XQ(A)
    • Try
      • Q(A);P_PINR(c)
      • Threat
        • DUALS(2)
      • Refutation
        • R(c);N_SPINR(c),XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • K(f);P_SPINR(c),S_FLIGHT,XS(C)::QAR1(A),XR(c)
      • Refutation
        • R(c);XQ(A)
    • Try
      • Q(A);
      • Threat
        • DUALS(3)
      • Refutation
        • K(f);S_FLIGHT,XS(C)
    • Try
      • Q(A);
      • Threat
        • QAR1(A),XR(c)
      • Vars
        • K(f);S_FLIGHT,XS(C)::QAR1(A),XR(c)
        • R(c);SBLOCK,XS(C)::R1(E)
        • R(c);::S(C)
      • Refutation
        • P(b);
  • Actual
    • Q(A);
    • Threat
      • QAR1(A),XR(c)
    • Vars
      • K(f);S_FLIGHT,XS(C)::QAR1(A),XR(c)
      • R(c);SBLOCK,XS(C)::QAR(A)
      • R(c);OGATE::QAR1(A)
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