MESON Chess Problem Database

Problem Display
PID: 233554 (6B1/4K1p1/2p3p1/3qR1P1/P1kP4/B2R4/4P3/8 w - - 0 1)

Viksna, Kristaps

Freie Presse, 1979

6B1/4K1p1/2p3p1/3qR1P1/P1kP4/B2R4/4P3/8

#2

9 + 5

15148 Sadier Collection 2021
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qe6+
      • 2.Bxe6#
    • 1...Qf7+
      • 2.Bxf7#
    • 1...Qxg8
      • 2.Rc5#
    • 1...c5
      • 2.Bxd5#
  • Tries
    • 1.Ke8?
      • 1...Qe6+
        • 2.Bxe6#
      • 1...Qf7+
        • 2.Bxf7#
      • 1...c5
        • 2.Bxd5#
      • 1...Qxg8+!
    • 1.Kf8?
      • 1...Qf7+
        • 2.Bxf7#
      • 1...Qe6
        • 2.Bxe6#
        • 2.Rc5#
      • 1...c5
        • 2.Bxd5#
      • 1...Qxg8+!
    • 1.Bc5?
      • 1...Qe6+
        • 2.Bxe6#
      • 1...Qf7+
        • 2.Bxf7#
      • 1...Qxg8!
    • 1.Be6?
      • 1...c5
        • 2.Bxd5#
      • 1...Qxe6+!
    • 1.Bf7?
      • 1...Qe6+
        • 2.Bxe6#
      • 1...c5
        • 2.Bxd5#
      • 1...Qxf7+!
    • 1.Rxd5?
      • threat
        • 2.Ra5#
        • 2.Rb5#
        • 2.Rc5#
        • 2.Re5#
        • 2.Rf5#
        • 2.Rd6#
        • 2.Rd7#
        • 2.Rd8#
      • 1...c5
        • 2.Rxc5#
        • 2.Re5#
        • 2.Rf5#
        • 2.Rd6#
        • 2.Rd7#
        • 2.Rd8#
      • 1...cxd5!
    • 1.Rf5?
      • 1...Qe6+
        • 2.Bxe6#
      • 1...Qf7+
        • 2.Bxf7#
      • 1...Qxg8
        • 2.Rc5#
      • 1...c5
        • 2.Bxd5#
      • 1...gxf5!
  • Keys
    • 1.Re4!
      • 1...Qe6+
        • 2.Bxe6#
      • 1...Qf7+
        • 2.Bxf7#
      • 1...Qxg8
        • 2.d5#
      • 1...c5
        • 2.dxc5#

Anticipated by 211133(1921)

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • Q(b);CHECK,OGATEB::B(I),XQ(b)
    • Q(b);N_SPINQ(b),OGATE,XB(I)::R1(F)
    • P(c);N_GUARD::B(I),XQ(b)
  • Tries
    • Try
      • K(H);P-FLIGHT
      • Vars
        • Q(b);CHECK,OGATEB::B(I),XQ(b)
        • P(c);N_GUARD::B(I),XQ(b)
      • Refutation
        • Q(b);CHECK,N_SPINQ(b),XB(I)
    • Try
      • K(H);S_FLIGHT
      • Vars
        • Q(b);CHECK,OGATEB::B(I),XQ(b)
        • P(c);N_GUARD::B(I),XQ(b)
      • Refutation
        • Q(b);CHECK,N_SPINQ(b),XB(I)
    • Try
      • B(B);
      • Vars
        • Q(b);CHECK,OGATEB::B(I),XQ(b)
      • Refutation
        • Q(b);N_SPINQ(b),XB(I)
    • Try
      • B(I);
      • Vars
        • P(c);N_GUARD::B(I),XQ(b)
      • Refutation
        • Q(b);CHECK,N_SPINQ(b),XB(I)
    • Try
      • B(I);
      • Vars
        • Q(b);CHECK,OGATEB::B(I),XQ(b)
        • P(c);N_GUARD::B(I),XQ(b)
      • Refutation
        • Q(b);CHECK,N_SPINQ(b),XB(I)
    • Try
      • R(F);XQ(b)
      • Threat
        • DUALS(8)
      • Refutation
        • P(c);P_SPINP(c),XR(F)
    • Try
      • R(F);
      • Vars
        • Q(b);CHECK,OGATEB::B(I),XQ(b)
        • Q(b);N_SPINQ(b),OGATE,XB(I)::R1(F)
        • P(c);N_GUARD::B(I),XQ(b)
      • Refutation
        • P(d);XR(F)
  • Actual
    • R(F);
    • Vars
      • Q(b);CHECK,OGATEB::B(I),XQ(b)
      • Q(b);N_SPINQ(b),OGATE,XB(I)::R(F)+P(E)
      • P(c);OGATE::R(F)+P(E),XP(c)
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