MESON Chess Problem Database

Problem Display
PID: 214054 (8/8/4p3/1pP1P3/1N2kp1R/2K3pB/QR3P2/B7 w - - 0 1)

Ruonala, Lauri Armas

Suomen Shakki, 1955

8/8/4p3/1pP1P3/1N2kp1R/2K3pB/QR3P2/B7

#2

10 + 5

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kf3
      • 2.Qa8#
    • 1...Kxe5
      • 2.Qxe6#
  • Tries
    • 1.Bg4?
      • threat
        • 2.Re2#
      • 1...Kxe5
        • 2.Qxe6#
      • 1...f3!
    • 1.Bf5+?
      • 1...Kf3
        • 2.Qa8#
      • 1...Kxe5
        • 2.Qxe6#
      • 1...exf5
        • 2.Qd5#
      • 1...Kxf5!
    • 1.Rb1?
      • threat
        • 2.Qe2#
      • 1...Kxe5
        • 2.Kd3#
        • 2.Qxe6#
      • 1...Kf3!
    • 1.Rxf4+?
      • 1...Kxe5
        • 2.Sd3#
      • 1...Kxf4!
    • 1.Qb1+?
      • 1...Kf3
        • 2.Qd3#
      • 1...Kxe5!
    • 1.Qc4+?
      • 1...Kf3
        • 2.Rxf4#
        • 2.Qe2#
        • 2.Qd3#
        • 2.Qxf4#
      • 1...Kxe5
        • 2.Qxe6#
        • 2.Qd4#
        • 2.Qxf4#
      • 1...bxc4!
    • 1.Qxe6?
      • threat
        • 2.Bg2#
        • 2.Qd5#
      • 1...Kf3
        • 2.Qd5#
        • 2.Qc6#
      • 1...g2
        • 2.Bxg2#
        • 2.Qd5#
      • 1...gxf2!
  • Keys
    • 1.Rb3!
      • threat
        • 2.Qe2#
      • 1...Kf3
        • 2.Kd4#
      • 1...Kxe5
        • 2.Kd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • K(b);N_SPINP(c),S_FLIGHT::QAB(B)
    • K(b);N_SPINP(c),OGATEB,P-FLIGHT,XP(J)::QAR1(B),XP(e)
  • Tries
    • Try
      • B(F);N_PINP(c)
      • Threat
        • R(C)
      • Vars
        • K(b);OGATEB,P-FLIGHT,XP(J)::QAR1(B),XP(e)
      • Refutation
        • P(c);
    • Try
      • B(F);CHECK
      • Vars
        • K(b);N_SPINP(c),S_FLIGHT::QAB(B)
        • K(b);N_SPINP(c),P-FLIGHT,XP(J)::QAR1(B),XP(e)
        • P(e);SBLOCK,XB(F)::QAB1(B)
      • Refutation
        • K(b);N_SPINP(c),S_FLIGHT,XB(F)
    • Try
      • R(C);
      • Threat
        • QAR2(B)
      • Refutation
        • K(b);N_SPINP(c),S_FLIGHT
    • Try
      • R(H);CHECK,XP(c)
      • Vars
        • K(b);P-FLIGHT,XP(J)::S(G)
      • Refutation
        • K(b);P-FLIGHT,XR(H)
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);N_SPINP(c),S_FLIGHT::QAR2(B)
      • Refutation
        • K(b);N_SPINP(c),P-FLIGHT,XP(J)
    • Try
      • Q(B);CHECK
      • Refutation
        • P(d);XQ(B)
    • Try
      • Q(B);XP(e)
      • Threat
        • DUALS(2)
      • Refutation
        • P(a);XP(D)
  • Actual
    • R(C);
    • Threat
      • QAR2(B)
    • Vars
      • K(b);N_SPINP(c),S_FLIGHT::R(C)+K(E)
      • K(b);N_SPINP(c),P-FLIGHT,XP(J)::B(A)+K(E)
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