MESON Chess Problem Database

Problem Display
PID: 9835 (8/p7/R2BN3/6p1/2k2pP1/2n2K2/2Q5/8 w - - 0 1)

Kochanowski, Jan

American Chess Bulletin, 1960

8/p7/R2BN3/6p1/2k2pP1/2n2K2/2Q5/8

#2

6 + 5

5454 Near Snap 2005
5454 Near Snap 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kb5
      • 2.Qd3#
    • 1...Kd5
      • 2.Qb3#
  • Tries
    • 1.Sxf4?
      • 1...Kd4
        • 2.Qd3#
      • 1...Kb5
        • 2.Qd3#
      • 1...gxf4!
    • 1.Sxg5?
      • 1...Kb5
        • 2.Qd3#
      • 1...Kd5
        • 2.Qd3#
      • 1...Kd4!
    • 1.Sg7?
      • 1...Kb5
        • 2.Qd3#
      • 1...Kd5
        • 2.Qd3#
      • 1...Kd4!
    • 1.Sd8?
      • 1...Kb5
        • 2.Qd3#
      • 1...Kd5
        • 2.Qd3#
      • 1...Kd4!
    • 1.Sf8?
      • 1...Kb5
        • 2.Qd3#
      • 1...Kd5
        • 2.Qd3#
      • 1...Kd4!
    • 1.Ba3?
      • 1...Kb5
        • 2.Qd3#
      • 1...Kd5!
    • 1.Bc5?
      • 1...Kb5
        • 2.Qd3#
      • 1...Kd5!
    • 1.Be7?
      • 1...Kb5
        • 2.Qd3#
      • 1...Kd5!
    • 1.Bf8?
      • 1...Kb5
        • 2.Qd3#
      • 1...Kd5!
    • 1.Qxc3+?
      • 1...Kb5
        • 2.Sc7#
        • 2.Qd3#
        • 2.Qc6#
      • 1...Kd5
        • 2.Sc7#
        • 2.Qb3#
      • 1...Kxc3!
  • Keys
    • 1.Sc5!
      • 1...Kb4
        • 2.Qb3#
      • 1...Kd4
        • 2.Qd3#
      • 1...Kb5
        • 2.Qb3#
      • 1...Kd5
        • 2.Qd3#

Anticipated by 16715(1942), 93933(1956), 92295(1958)

This anticipates 233481(1984), 96514(1988)

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(b);N_SPINS(a),S_FLIGHT::QAB(A)
  • Tries
    • Try
      • S(F);XP(c)
      • Vars
        • K(b);N_SPINS(a),P-FLIGHT::QAR1(A)
        • K(b);N_SPINS(a),S_FLIGHT::QAB(A)
      • Refutation
        • P(d);XS(F)
    • Try
      • S(F);XP(d)
      • Vars
        • K(b);N_SPINS(a),S_FLIGHT::QAB(A)
        • K(b);N_SPINS(a),S_FLIGHT::QAR2(A)
      • Refutation
        • K(b);N_SPINS(a),P-FLIGHT
    • Try
      • S(F);
      • Vars
        • K(b);N_SPINS(a),S_FLIGHT::QAB(A)
        • K(b);N_SPINS(a),S_FLIGHT::QAR2(A)
      • Refutation
        • K(b);N_SPINS(a),P-FLIGHT
    • Try
      • S(F);
      • Vars
        • K(b);N_SPINS(a),S_FLIGHT::QAB(A)
        • K(b);N_SPINS(a),S_FLIGHT::QAR2(A)
      • Refutation
        • K(b);N_SPINS(a),P-FLIGHT
    • Try
      • S(F);
      • Vars
        • K(b);N_SPINS(a),S_FLIGHT::QAB(A)
        • K(b);N_SPINS(a),S_FLIGHT::QAR2(A)
      • Refutation
        • K(b);N_SPINS(a),P-FLIGHT
    • Try
      • B(E);
      • Vars
        • K(b);N_SPINS(a),S_FLIGHT::QAB(A)
      • Refutation
        • K(b);N_SPINS(a),S_FLIGHT
    • Try
      • B(E);
      • Vars
        • K(b);N_SPINS(a),S_FLIGHT::QAB(A)
      • Refutation
        • K(b);N_SPINS(a),S_FLIGHT
    • Try
      • B(E);
      • Vars
        • K(b);N_SPINS(a),S_FLIGHT::QAB(A)
      • Refutation
        • K(b);N_SPINS(a),S_FLIGHT
    • Try
      • B(E);
      • Vars
        • K(b);N_SPINS(a),S_FLIGHT::QAB(A)
      • Refutation
        • K(b);N_SPINS(a),S_FLIGHT
    • Try
      • Q(A);CHECK,XS(a)
      • Refutation
        • K(b);P-FLIGHT,XQ(A)
  • Actual
    • S(F);
    • Vars
      • K(b);N_SPINS(a),P-FLIGHT::QAR1(A)
      • K(b);N_SPINS(a),S_FLIGHT::QAR2(A)
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