MESON Chess Problem Database

Problem Display
PID: 10646 (8/p7/8/4NN2/1n6/K6p/Q1B2k2/R7 w - - 0 1)

Petkov, Petko Andonov

1st Prize, Shakhmatna misl, 1966

8/p7/8/4NN2/1n6/K6p/Q1B2k2/R7

#2

6 + 4

3840 Petkov Selected Compositions 2000
102 Probleemblad 2001
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ke2
      • 2.Bd3#
    • 1...Kg2
      • 2.Be4#
    • 1...Sxc2+
      • 2.Qxc2#
    • 1...Sd3
      • 2.Bxd3#
    • 1...Sd5
      • 2.Bb3#
      • 2.Bd3#
      • 2.Ba4#
      • 2.Be4#
    • 1...Sa6
      • 2.Bb3#
      • 2.Bd3#
      • 2.Ba4#
      • 2.Be4#
    • 1...Sc6
      • 2.Bb3#
      • 2.Bd3#
      • 2.Ba4#
      • 2.Be4#
  • Tries
    • 1.Kxb4?
      • threat
        • 2.Bb3#
        • 2.Bd3#
        • 2.Ba4#
        • 2.Be4#
      • 1...Ke2
        • 2.Bb3#
        • 2.Bd3#
        • 2.Ba4#
        • 2.Be4#
      • 1...Kg2
        • 2.Bb3#
        • 2.Bd3#
        • 2.Ba4#
        • 2.Be4#
      • 1...a5+!
    • 1.Bb3+?
      • 1...Sc2+
        • 2.Qxc2#
      • 1...Sxa2!
    • 1.Bd3+?
      • 1...Sc2+
        • 2.Qxc2#
      • 1...Sxa2!
    • 1.Ba4+?
      • 1...Sc2+
        • 2.Qxc2#
      • 1...Sxa2!
    • 1.Be4+?
      • 1...Sc2+
        • 2.Qxc2#
      • 1...Sxa2!
    • 1.Qb3?
      • threat
        • 2.Qf3#
      • 1...Sxc2+
        • 2.Qxc2#
      • 1...Ke2
        • 2.Qe3#
      • 1...Kg2
        • 2.Qg3#
      • 1...Sd3!
    • 1.Qc4?
      • threat
        • 2.Qf1#
      • 1...Sxc2+
        • 2.Qxc2#
      • 1...Kg2
        • 2.Qe2#
      • 1...Sd3!
  • Keys
    • 1.Qb1!
      • threat
        • 2.Qf1#
      • 1...Sxc2+
        • 2.Qxc2#
      • 1...Ke2
        • 2.Qe1#
      • 1...Kg2
        • 2.Qg1#

This anticipates 12218(1976)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • K(a);P-FLIGHT::QAR(B)+B(C),DCHECK
    • S(c);CHECK,OGATE,P_SPINS(c),XB(C)::QAR(B),XS(c)
    • S(c);N_GUARD::QAR(B)+B(C),XS(c)
  • Tries
    • Try
      • K(D);S_FLIGHT,XS(c)
      • Threat
        • DUALS(4)
      • Refutation
        • P(d);CHECK
    • Try
      • B(C);CHECK
      • Vars
        • S(c);CHECK,N_GUARD,P_SPINS(c)::QAR(B),XS(c)
      • Refutation
        • S(c);XQ(B)
    • Try
      • B(C);CHECK
      • Vars
        • S(c);CHECK,N_GUARD,P_SPINS(c)::QAR(B),XS(c)
      • Refutation
        • S(c);XQ(B)
    • Try
      • B(C);CHECK
      • Vars
        • S(c);CHECK,N_GUARD,P_SPINS(c)::QAR(B),XS(c)
      • Refutation
        • S(c);XQ(B)
    • Try
      • B(C);CHECK
      • Vars
        • S(c);CHECK,N_GUARD,P_SPINS(c)::QAR(B),XS(c)
      • Refutation
        • S(c);XQ(B)
    • Try
      • Q(B);
      • Threat
        • QAR1(B)
      • Vars
        • S(c);CHECK,OGATE,XB(C)::QAR(B),XS(c)
        • K(a);P-FLIGHT::QAR1(B)
      • Refutation
        • S(c);
    • Try
      • Q(B);
      • Threat
        • QAR1(B)
      • Vars
        • S(c);CHECK,OGATE,XB(C)::QAR(B),XS(c)
        • K(a);P-FLIGHT::QAR2(B)
      • Refutation
        • S(c);
  • Actual
    • Q(B);
    • Threat
      • QAR1(B)
    • Vars
      • S(c);CHECK,OGATE,XB(C)::QAR(B),XS(c)
      • K(a);P-FLIGHT::QAR1(B)
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