MESON Chess Problem Database

Problem Display
PID: 232816 (3bN3/3p4/2pr2P1/1b1k4/4R3/K7/5B2/1Q6 w - - 0 1)

Koller, Paul

Freie Presse, 1968

3bN3/3p4/2pr2P1/1b1k4/4R3/K7/5B2/1Q6

#2

6 + 6

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Bd3
      • 2.Qxd3#
    • 1...Ba4
      • 2.Qd3#
    • 1...Bh4
      • 2.Sc7#
    • 1...Bg5
      • 2.Sc7#
    • 1...Bf6
      • 2.Sc7#
    • 1...Bc7
      • 2.Sxc7#
    • 1...Be7
      • 2.Sc7#
  • Tries
    • 1.Rd4+?
      • 1...Ke5
        • 2.Qe4#
      • 1...Ke6
        • 2.Qe4#
      • 1...Kc5!
    • 1.Re5+?
      • 1...Kc4
        • 2.Rc5#
        • 2.Qc2#
        • 2.Qb3#
      • 1...Kxe5!
    • 1.Qa2+?
      • 1...Bc4
        • 2.Qxc4#
      • 1...Kxe4!
    • 1.Qd1+?
      • 1...Bd3
        • 2.Qxd3#
      • 1...Kxe4!
    • 1.Qb3+?
      • 1...Bc4
        • 2.Qxc4#
      • 1...Kxe4!
  • Keys
    • 1.Rc4!
      • threat
        • 2.Qe4#
      • 1...Kxc4
        • 2.Qb3#
      • 1...Ke5
        • 2.Qe4#
      • 1...Ke6
        • 2.Qe4#
      • 1...Bxc4
        • 2.Qf5#
      • 1...Re6
        • 2.Rc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 7
  • Sets
    • B(a);N_GUARD::QAR2(A),XB(a)
    • B(a);N_GUARD::QAR2(A)
    • B(f);N_GUARD::S(F)
    • B(f);N_GUARD::S(F),XB(f)
  • Tries
    • Try
      • R(D);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(A)
        • K(b);S_FLIGHT::QAR2(A)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • R(D);CHECK
      • Refutation
        • K(b);P-FLIGHT,XR(D)
    • Try
      • Q(A);CHECK
      • Vars
        • B(a);N_GUARD,P_SPINB(a)::QAB1(A),XB(a)
      • Refutation
        • K(b);S_FLIGHT,XR(D)
    • Try
      • Q(A);CHECK
      • Vars
        • B(a);N_GUARD,P_SPINB(a)::QAR2(A),XB(a)
      • Refutation
        • K(b);S_FLIGHT,XR(D)
    • Try
      • Q(A);CHECK
      • Vars
        • B(a);N_GUARD,P_SPINB(a)::QAB1(A),XB(a)
      • Refutation
        • K(b);S_FLIGHT,XR(D)
  • Actual
    • R(D);
    • Threat
      • QAB1(A)
    • Vars
      • K(b);OGATEB,S_FLIGHT,XR(D)::QAB1(A)
      • K(b);P-FLIGHT::QAR1(A)
      • K(b);S_FLIGHT::QAR2(A)
      • B(a);SBLOCK,XR(D)::QAR2(A)
      • R(d);SBLOCK::R1(D)
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